Allantois
Yolk Sac
The first of four extra-embryonic membranes to form during EMBRYOGENESIS. In REPTILES and BIRDS, it arises from endoderm and mesoderm to incorporate the EGG YOLK into the DIGESTIVE TRACT for nourishing the embryo. In placental MAMMALS, its nutritional function is vestigial; however, it is the source of INTESTINAL MUCOSA; BLOOD CELLS; and GERM CELLS. It is sometimes called the vitelline sac, which should not be confused with the VITELLINE MEMBRANE of the egg.
Extraembryonic Membranes
The thin layers of tissue that surround the developing embryo. There are four extra-embryonic membranes commonly found in VERTEBRATES, such as REPTILES; BIRDS; and MAMMALS. They are the YOLK SAC, the ALLANTOIS, the AMNION, and the CHORION. These membranes provide protection and means to transport nutrients and wastes.
Chorion
Primitive Streak
Mesoderm
Blood Vessels
Embryo, Mammalian
Placenta
A highly vascularized mammalian fetal-maternal organ and major site of transport of oxygen, nutrients, and fetal waste products. It includes a fetal portion (CHORIONIC VILLI) derived from TROPHOBLASTS and a maternal portion (DECIDUA) derived from the uterine ENDOMETRIUM. The placenta produces an array of steroid, protein and peptide hormones (PLACENTAL HORMONES).
T-Box Domain Proteins
Proteins containing a region of conserved sequence, about 200 amino acids long, which encodes a particular sequence specific DNA binding domain (the T-box domain). These proteins are transcription factors that control developmental pathways. The prototype of this family is the mouse Brachyury (or T) gene product.
Amnion
Coturnix
Gene Expression Regulation, Developmental
In Situ Hybridization
Epithelium
Gastrula
The developmental stage that follows BLASTULA or BLASTOCYST. It is characterized by the morphogenetic cell movements including invagination, ingression, and involution. Gastrulation begins with the formation of the PRIMITIVE STREAK, and ends with the formation of three GERM LAYERS, the body plan of the mature organism.
Pregnancy
Receptors, Growth Factor
Encyclopedias as Topic
Reptiles
Dinosaurs
Radioactive Waste
Liquid, solid, or gaseous waste resulting from mining of radioactive ore, production of reactor fuel materials, reactor operation, processing of irradiated reactor fuels, and related operations, and from use of radioactive materials in research, industry, and medicine. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Unified Medical Language System
A research and development program initiated by the NATIONAL LIBRARY OF MEDICINE to build knowledge sources for the purpose of aiding the development of systems that help health professionals retrieve and integrate biomedical information. The knowledge sources can be used to link disparate information systems to overcome retrieval problems caused by differences in terminology and the scattering of relevant information across many databases. The three knowledge sources are the Metathesaurus, the Semantic Network, and the Specialist Lexicon.
Natural Language Processing
Medical Subject Headings
Terminology as Topic
Powders
Tryptophan
An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals.
Sedum
Plants, Genetically Modified
Plant Leaves
Receptor, TIE-2
Angiopoietin-1
Neovascularization, Pathologic
Angiopoietin-2
An angiopoietin that is closely related to ANGIOPOIETIN-1. It binds to the TIE-2 RECEPTOR without receptor stimulation and antagonizes the effect of ANGIOPOIETIN-1. However its antagonistic effect may be limited to cell receptors that occur within the vasculature. Angiopoietin-2 may therefore play a role in down-regulation of BLOOD VESSEL branching and sprouting.
Angiopoietins
Receptor, TIE-1
PubMed
A bibliographic database that includes MEDLINE as its primary subset. It is produced by the National Center for Biotechnology Information (NCBI), part of the NATIONAL LIBRARY OF MEDICINE. PubMed, which is searchable through NLM's Web site, also includes access to additional citations to selected life sciences journals not in MEDLINE, and links to other resources such as the full-text of articles at participating publishers' Web sites, NCBI's molecular biology databases, and PubMed Central.
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MEDLINE
Mrj encodes a DnaJ-related co-chaperone that is essential for murine placental development. (1/343)
We have identified a novel gene in a gene trap screen that encodes a protein related to the DnaJ co-chaperone in E. coli. The gene, named Mrj (mammalian relative of DnaJ) was expressed throughout development in both the embryo and placenta. Within the placenta, expression was particularly high in trophoblast giant cells but moderate levels were also observed in trophoblast cells of the chorion at embryonic day 8.5, and later in the labyrinth which arises from the attachment of the chorion to the allantois (a process called chorioallantoic fusion). Insertion of the ROSAbetageo gene trap vector into the Mrj gene created a null allele. Homozygous Mrj mutants died at mid-gestation due to a failure of chorioallantoic fusion at embryonic day 8.5, which precluded formation of the mature placenta. At embryonic day 8.5, the chorion in mutants was morphologically normal and expressed the cell adhesion molecule beta4 integrin that is known to be required for chorioallantoic fusion. However, expression of the chorionic trophoblast-specific transcription factor genes Err2 and Gcm1 was significantly reduced. The mutants showed no abnormal phenotypes in other trophoblast cell types or in the embryo proper. This study indicates a previously unsuspected role for chaperone proteins in placental development and represents the first genetic analysis of DnaJ-related protein function in higher eukaryotes. Based on a survey of EST databases representing different mouse tissues and embryonic stages, there are 40 or more DnaJ-related genes in mammals. In addition to Mrj, at least two of these genes are also expressed in the developing mouse placenta. The specificity of the developmental defect in Mrj mutants suggests that each of these genes may have unique tissue and cellular activities. (+info)Canine preprorelaxin: nucleic acid sequence and localization within the canine placenta. (2/343)
Employing uteroplacental tissue at Day 35 of gestation, we determined the nucleic acid sequence of canine preprorelaxin using reverse transcription- and rapid amplification of cDNA ends-polymerase chain reaction. Canine preprorelaxin cDNA consisted of 534 base pairs encoding a protein of 177 amino acids with a signal peptide of 25 amino acids (aa), a B domain of 35 aa, a C domain of 93 aa, and an A domain of 24 aa. The putative receptor binding region in the N'-terminal part of the canine relaxin B domain GRDYVR contained two substitutions from the classical motif (E-->D and L-->Y). Canine preprorelaxin shared highest homology with porcine and equine preprorelaxin. Northern analysis revealed a 1-kilobase transcript present in total RNA of canine uteroplacental tissue but not of kidney tissue. Uteroplacental tissue from two bitches each at Days 30 and 35 of gestation were studied by in situ hybridization to localize relaxin mRNA. Immunohistochemistry for relaxin, cytokeratin, vimentin, and von Willebrand factor was performed on uteroplacental tissue at Day 30 of gestation. The basal cell layer at the core of the chorionic villi was devoid of relaxin mRNA and immunoreactive relaxin or vimentin but was immunopositive for cytokeratin and identified as cytotrophoblast cells. The cell layer surrounding the chorionic villi displayed specific hybridization signals for relaxin mRNA and immunoreactivity for relaxin and cytokeratin but not for vimentin, and was identified as syncytiotrophoblast. Those areas of the chorioallantoic tissue with most intense relaxin immunoreactivity were highly vascularized as demonstrated by immunoreactive von Willebrand factor expressed on vascular endothelium. The uterine glands and nonplacental uterine areas of the canine zonary girdle placenta were devoid of relaxin mRNA and relaxin. We conclude that the syncytiotrophoblast is the source of relaxin in the canine placenta. (+info)Cortisol in fetal fluids and the fetal adrenal at parturition in the tammar wallaby (Macropus eugenii). (3/343)
Glucocorticoid hormones may play a critical role in initiating parturition in tammar wallabies. In this study, we investigated the concentration of cortisol in fetal fluids and cortisol production by fetal adrenals over the last 3 days of the 26-day pregnancy and within 24 h postpartum. The fetal adrenals almost doubled in size between Days 24 and 26 of pregnancy, and their cortisol content increased over 10-fold during this period, from 10 pg to over 100 pg per adrenal pair. After birth, neonatal adrenals continued to grow, but cortisol content fell dramatically to 20 pg. The prepartum increase in adrenal cortisol was reflected by a substantial rise in cortisol concentrations in yolk sac fluid, allantoic fluid, and fetal blood, which were below 10 ng/ml on Day 24 and rose to over 40 ng/ml by Day 26. Cortisol concentrations in neonatal blood decreased postpartum, mirroring decreased cortisol content in neonatal adrenals. Cortisol production by the fetal adrenal was stimulated in vitro by ACTH and prostaglandin E2, suggesting that the in vivo increase may be stimulated by release of ACTH from the fetal hypothalamic-pituitary axis and prostaglandin E2 from the placenta. These results indicate that increasing cortisol production by the fetal adrenal is a characteristic of late pregnancy in the tammar wallaby and support the suggestion that fetal cortisol may trigger the initiation of parturition in this marsupial species. (+info)Bmp4 is required for the generation of primordial germ cells in the mouse embryo. (4/343)
In many organisms the allocation of primordial germ cells (PGCs) is determined by the inheritance of maternal factors deposited in the egg. However, in mammals, inductive cell interactions are required around gastrulation to establish the germ line. Here, we show that Bmp4 homozygous null embryos contain no PGCs. They also lack an allantois, an extraembryonic mesodermal tissue derived, like the PGCs, from precursors in the proximal epiblast. Heterozygotes have fewer PGCs than normal, due to a reduction in the size of the founding population and not to an effect on its subsequent expansion. Analysis of beta-galactosidase activity in Bmp4(lacZneo) embryos reveals that prior to gastrulation, Bmp4 is expressed in the extraembryonic ectoderm. Later, Bmp4 is expressed in the extraembryonic mesoderm, but not in PGCs. Chimera analysis indicates that it is the Bmp4 expression in the extraembryonic ectoderm that regulates the formation of allantois and primordial germ cell precursors, and the size of the founding population of PGCs. The initiation of the germ line in the mouse therefore depends on a secreted signal from the previously segregated, extraembryonic, trophectoderm lineage. (+info)Identification of endothelial cell binding sites on the laminin gamma 1 chain. (5/343)
The laminins belong to a family of trimeric basement membrane glycoproteins with multiple domains, structures, and functions. Endothelial cells bind laminin-1 and form capillary-like structures when plated on a laminin-1-rich basement membrane matrix, Matrigel. Laminin-1 is composed of 3 chains, alpha1, beta1, and gamma1. Because laminin-1 is known to contain multiple biologically active sites, we have screened 156 synthetic overlapping peptides spanning the entire laminin gamma1 chain for potential angiogenic sequences. Only 7 of these peptides, designated as C16, C25, C30, C38, C64, C75, and C102, disrupted the formation of capillary-like structures by human umbilical vein endothelial cells on Matrigel. Dose-response experiments in the presence of 50 to 200 microg/mL showed that tube formation was prevented by most peptides at 150 and 200 microg/mL, except for C16, which showed strong activity at all concentrations. Active peptides promoted vessel sprouting from aorta rings and angiogenesis in the chick chorioallantoic membrane assay. In addition, the active peptides also promoted endothelial cell adhesion to dishes coated with 0.1 microg of peptide and inhibited attachment to laminin-1 but not to plastic or fibronectin. Four of the active peptides, C25, C38, C75, and C102, may have cell-type specificity with endothelial cells, since they did not promote PC12 neurite outgrowth or adhesion of B16-F10 melanoma and human submandibular gland cells. These results suggest that specific laminin gamma1-chain peptides have angiogenic activity with potential therapeutic applications. (+info)Human erythropoietin induces a pro-angiogenic phenotype in cultured endothelial cells and stimulates neovascularization in vivo. (6/343)
Hematopoietic and endothelial cell lineages share common progenitors. Accordingly, cytokines formerly thought to be specific for the hematopoietic system have been shown to affect several functions in endothelial cells, including angiogenesis. In this study, we investigated the angiogenic potential of erythropoietin (Epo), the main hormone regulating proliferation, differentiation, and survival of erythroid cells. Epo receptors (EpoRs) have been identified in the human EA.hy926 endothelial cell line by Western blot analysis. Also, recombinant human Epo (rHuEpo) stimulates Janus Kinase-2 (JAK-2) phosphorylation, cell proliferation, and matrix metalloproteinase-2 (MMP-2) production in EA.hy926 cells and significantly enhances their differentiation into vascular structures when seeded on Matrigel. In vivo, rHuEpo induces a potent angiogenic response in the chick embryo chorioallantoic membrane (CAM). Accordingly, endothelial cells of the CAM vasculature express EpoRs, as shown by immunostaining with an anti-EpoR antibody. The angiogenic response of CAM blood vessels to rHuEpo was comparable to that elicited by the prototypic angiogenic cytokine basic fibroblast growth factor (FGF2), it occurred in the absence of a significant mononuclear cell infiltrate, and it was not mimicked by endothelin-1 (ET-1) treatment. Taken together, these data demonstrate the ability of Epo to interact directly with endothelial cells and to elicit an angiogenic response in vitro and in vivo and thus act as a bona fide direct angiogenic factor. (+info)Purine analogue 6-methylmercaptopurine riboside inhibits early and late phases of the angiogenesis process. (7/343)
Angiogenesis has been identified as an important target for antineoplastic therapy. The use of purine analogue antimetabolites in combination chemotherapy of solid tumors has been proposed. To assess the possibility that selected purine analogues may affect tumor neovascularization, 6-methylmercaptopurine riboside (6-MMPR), 6-methylmercaptopurine, 2-aminopurine, and adenosine were evaluated for the capacity to inhibit angiogenesis in vitro and in vivo. 6-MMPR inhibited fibroblast growth factor-2 (FGF2)-induced proliferation and delayed the repair of mechanically wounded monolayer in endothelial GM 7373 cell cultures. 6-MMPR also inhibited the formation of solid sprouts within fibrin gel by FGF2-treated murine brain microvascular endothelial cells and the formation of capillary-like structures on Matrigel by murine aortic endothelial cells transfected with FGF2 cDNA. 6-MMPR affected FGF2-induced intracellular signaling in murine aortic endothelial cells by inhibiting the phosphorylation of extracellular signal-regulated kinase-2. The other molecules were ineffective in all of the assays. In vivo, 6-MMPR inhibited vascularization in the chick embryo chorioallantoic membrane and prevented blood vessel formation induced by human endometrial adenocarcinoma specimens grafted onto the chorioallantoic membrane. Also, topical administration of 6-MMPR caused the regression of newly formed blood vessels in the rabbit cornea. Thus, 6-MMPR specifically inhibits both the early and the late phases of the angiogenesis process in vitro and exerts a potent anti-angiogenic activity in vivo. These results provide a new rationale for the use of selected purine analogues in combination therapy of solid cancer. (+info)Functional involvement of carbonic anhydrase in calcium transport of the chick chorioallantoic membrane. (8/343)
Carbonic anhydrase activity was demonstrated in the chick-embryonic chorioallantoic membrane and was correlated with the Ca2+-transport activity of the membrane. It is inhibited by sulphonamides and is expressed in the chorioallantoic membrane in an age-dependent fashion during embryonic development. Ca2+ uptake by the chorioallantoic membrane in vivo also increases in a similar age-dependent manner. The temporal increase in these activities is coincident with calcium deposition in the embryonic skeleton. Incubation of the chorioallantoic membrane in ovo with sulphonamides specifically inhibits both the carbonic anhydrase and the Ca2+ uptake activities of the membrane in vivo. Enzyme histochemistry revealed the carbonic anhydrase activity is localized in the Ca2+-transporting ectodermal cells of the chorioallantoic membrane. These results, taken together, indicate that carbonic anhydrase may be functionally important in the Ca2+-transport activity of the chorioallantoic membrane. (+info)
Allantois - Wikipedia
Acetylcholinesterase Inhibitors Promote Angiogenesis in Chick Chorioallantoic Membrane and Inhibit Apoptosis of Endothelial...
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An in vivo neovascularization assay for screening regulators of angiogenesis and assessing their effects on pre-existing vessels
Gene Expression Literature Detail
BIOETYMOLOGY : ORIGIN IN BIOMEDICAL TERMS: allantochorion
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BIOETYMOLOGY : ORIGIN IN BIOMEDICAL TERMS: allantois
Cow Fetus | ClipArt ETC
Allantoic | Definition of Allantoic by Merriam-Webster
Angiogenic activity of multiple myeloma endothelial cells in vivo in the chick embryo chorioallantoic membrane assay is...
Desmin-positive pericytes in the chick embryo chorioallantoic membrane in response to fibroblast growth factor-2<...
Chorioallantoic membrane - Wikipedia
IJMS | Free Full-Text | Chick Chorioallantoic Membrane (CAM) Assay as an In Vivo Model to Study the Effect of Newly Identified...
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VITRIFICATION AND CHORIOALLANTOIC MEMBRANE (CAM) CULTURE OF BOVINE OVARIAN TISSUE
A quantitative study of the chorioallantoic membrane reaction in the chick embryo | Proceedings of the Royal Society of London...
Specific antigens from tumors after prolonged cultivation on the chorioallantoic membrane of the chick embryo | SpringerLink
Inhibition of trophoblast stem cell potential in chorionic ectoderm coincides with occlusion of the ectoplacental cavity in the...
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UABP - Uteroferrin Associated Basic Protein | AcronymFinder
Wilhelm Krause
Ueber die Allantois des Menschen, 1875. Handbuch der menschlichen Anatomie. (Third edition of his father's work) 3 volumes; ...
Reptiliomorpha
A very small allantois is found in modern amphibians. Later came the amnion surrounding the fetus proper, and the chorion, ... The first to evolve was probably the allantois, a sack that develops from the gut/yolk-sack. This sack contains the embryo's ... encompassing the amnion, allantois, and yolk-sack. Exactly where the border between reptile-like amphibians (non-amniote ...
Reptile
The allantois (8) is a sac that collects the metabolic waste produced by the embryo. The amniotic sac (10) contains amniotic ... An amnion, chorion, and allantois are present during embryonic life. The eggshell (1) protects the crocodile embryo (11) and ...
Development of the urinary system
In other words, the allantois takes no share in its formation. After the separation of the rectum from the dorsal part of the ... The vesico-urethral portion is the deepest, continuous with the allantois. It absorbs the ends of the Wolffian ducts and the ...
Development of the reproductive system
The vesico-urethral portion is the deepest portion, continuous with the allantois. It absorbs the ends of the mesonephric ducts ...
Fetal membranes
The other fetal membranes are the allantois and the secondary umbilical vesicle. The fetal membranes surround the developing ...
Notommata
Species: Notommata aethis Myers, 1933 Notommata allantois Wulfert, 1935 "Notommata Ehrenberg, 1830". www.gbif.org. Retrieved 5 ...
Urachal cyst
A urachal cyst is a sinus remaining from the allantois during embryogenesis. It is a cyst which occurs in the remnants between ...
Median umbilical ligament
It contains the urachus, which is the obliterated form of the allantois. The allantois forms a communication between the cloaca ... The median umbilical ligament begins as the allantois in the embryonic period. It then becomes the urachus in the fetus. This ...
Development of the gonads
Germ cells migrate from near the allantois and colonize the primordial gonads. In the female, the germ cells colonise the ...
Chorioallantoic membrane
Development of the allantois occurs extra embryonically from the ventral wall of the endodermal hindgut. Partial fusion of the ... It is formed by the fusion of the mesodermal layers of two extra-embryonic membranes - the chorion and the allantois. It is the ... The development of the CAM is similar to that of the allantois in mammals. Its growth starts from day 3 of embryonic ... chorion and allantois occurs between days 5 and 6. By day 10, there is an extensive formation of capillary network. The ...
Chorion
To compensate for this, the chorion and the allantois fuse together to form the chorioallantoic membrane. Together these form a ...
Reptile
The allantois (8) is a sac that collects the metabolic waste produced by the embryo. The amniotic sac (10) contains amniotic ... An amnion, chorion, and allantois are present during embryonic life. The eggshell (1) protects the crocodile embryo (11) and ... 1. eggshell, 2. yolk sac, 3. yolk (nutrients), 4. vessels, 5. amnion, 6. chorion, 7. air space, 8. allantois, 9. albumin (egg ...
Monotreme
1) Shell; 2) Yolk; 3) Yolk Sac; 4) Allantois; 5) Embryo; 6) Amniotic Fluid; 7) Amniotic Membrane; and 8) Membrane ...
Umbilical cord
The umbilical cord develops from and contains remnants of the yolk sac and allantois. It forms by the fifth week of development ...
TBX4
... has been shown to be expressed in the allantois, hindlimb, lung and proctodeum. Expression of Tbx4 is activated by a ... embryos with the Tbx4-mutant gene were observed to have allantoises that were apoptotic, stunted, and displayed abnormal ... "Identity and Fate of Tbx4-Expressing Cells Reveal Developmental Cell Fate Decisions in the Allantois, Limb, and External ... various abnormalities were observed in the development of the allantois. Choirioallantoic fusion fails to occur in embryos with ...
Urachal diverticulum
... is a congenital disorder caused by the partial persistence of the allantois. The allantois, which later becomes the urachus, ...
Placenta
... l mammals, such as humans, have a chorioallantoic placenta that forms from the chorion and allantois. In humans, the ...
Allantoin
... are allantois acid, or the same substance that one found in the allantois fluid of cows; we will call it "allantoin" from now ... In 1821, the French chemist Jean Louis Lassaigne found it in the fluid of the allantois; he called it "l'acide allantoique". In ... Named after the allantois (an amniote embryonic excretory organ in which it concentrates during development in most mammals ...
Callophrys xami
In Mexico, Echevelia gibbiflora and Sedum allantoides are the most common host plants. The role of host plants is integral to ...
Embryo drawing
Haeckel speculates that the allantois is formed in a similar way in both humans and other mammals. His, on the other hand, ... Although Haeckel is proven right about the allantois, the utilization of Krause's embryo as justification turns out to be ...
Urinary bladder
The human urinary bladder derives from the urogenital sinus, and it is initially continuous with the allantois. The upper and ...
Cloaca (embryology)
The hind-gut is at first prolonged backward into the body-stalk as the tube of the allantois; but, with the growth and flexure ... and consequently a bend is formed at the junction of the hind-gut and allantois. This bend becomes dilated into a pouch, which ... constitutes the endodermal cloaca; into its dorsal part the hind-gut opens, and from its ventral part the allantois passes ...
Blood islands
... arise external to the developing embryo on the umbilical vesicle, allantois, connecting stalk and chorion. They ... They develop from undifferentiated hemangioblasts in blood vessels in the walls of the umbilical vesicle, allantois and chorion ...
Excretory system
Embryologically, the bladder is derived from the urogenital sinus, and it is initially continuous with the allantois. In human ...
2009 swine flu pandemic vaccine
The virus replicates within the allantois of the embryo, which is the equivalent of the placenta in mammals. The fluid in this ...
Retinol-binding protein
RBP mRNA was localized to epithelial cells of the chorion, allantois, and amnion at day 45 of pregnancy. Lastly, RBP mRNA was ...
Hematopoietic stem cell niche
Mice have also shown hematopoietic activity in the umbilical arteries and the allantois, in which HSCs and endothelial cells ... Inman KE, Downs KM (2007). "The murine allantois: emerging paradigms in development of the mammalian umbilical cord and its ...
Human embryonic development
The inner cell mass will give rise to the pre-embryo, the amnion, yolk sac and allantois, while the fetal part of the placenta ... Blood islands develop outside the embryo, on the umbilical vesicle, allantois, connecting stalk, and chorion, from mesodermal ...
Egg
Membranes: allantois, chorion, amnion, and vitellus/ yolk.. The egg is the organic vessel containing the zygote in which an ...
Allantois - Wikipedia
The allantois (plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a ... Also, most marsupial allantoises do not fuse with the chorion. An exception is the allantois of the bandicoot, which has a ... "Allantois". dictionary.com. Downs, KM (1998). "The Murine Allantois". Curr Top Dev Biol. 39: 1-33. doi:10.1016/s0070-2153(08) ... In placental mammals, the allantois is part of and forms an axis for the development of the umbilical cord. The mouse allantois ...
allantois - definition and meaning
allantois: A membranous sac that develops from the posterior part of the digestive tract in the embryos of mammals, birds, and ... reesetee commented on the word allantois No, I didnt--or if I did, Ive forgotten. But I think I have just the list for it ... chained_bear commented on the word allantois Reesetee, did you know this name? I didnt. (I thought it was just membrane or ... Covering the external face of the amnion and lining the inner face of the chorion is a double membrane, _the allantois_. ...
Allantois adenomatous dysplasia | definition of allantois adenomatous dysplasia by Medical dictionary
What is allantois adenomatous dysplasia? Meaning of allantois adenomatous dysplasia medical term. What does allantois ... Looking for online definition of allantois adenomatous dysplasia in the Medical Dictionary? allantois adenomatous dysplasia ... allantois. (redirected from allantois adenomatous dysplasia). Also found in: Dictionary, Thesaurus, Encyclopedia. allantois. [ ... allantois. (ə-lăn′tō-ĭs). n. pl. allantoides (ăl′ən-tō′ĭ-dēz′) A membranous sac that develops from the posterior part of the ...
Brachyury is required for elongation and vasculogenesis in the murine allantois | Development
Brachyury is required for elongation and vasculogenesis in the murine allantois Message Subject (Your Name) has sent you a ... Fetal liver kinase (Flk1)-positive angioblasts were significantly decreased in TC/TC allantoises and did not coalesce into ... Mouse conceptuses homozygous for mutations in brachyury (T) exhibit a short, misshapen allantois that fails to fuse with the ... T protein was recently identified in several new sites during mouse gastrulation, including the core of the allantois, where ...
Allantois | Article about allantois by The Free Dictionary
Find out information about allantois. A fluid-filled sac- or sausagelike, extraembryonic membrane lying between the outer ... chorion and the inner amnion and yolk sac of the embryos of reptiles,... Explanation of allantois ... allantois. Also found in: Dictionary, Thesaurus, Medical, Wikipedia.. Related to allantois: yolk sac, urachus, Vitelline duct ... In the latter two groups the allantois assists in the absorption of albumin. In some mammals, including humans, the allantois ...
Notes on Yolk-sac, Amnion and Chorion and Allantois
... !. 1. Yolk-sac:. It is the first structure to appear during the development ... 3. Allantois:. After 60 hours of incubation, a cloacal diverticulum of endoderm grows out from the hind gut of the embryo just ... The allantois grows rapidly and within ten days completely surrounds the embryo and yolk sac and fills the extra-embryonic ... The allantois is highly vascular and serves for respiratory exchanges. The oxygen diffusing inwards through the porous shell ...
Allantois
... ryšiai: platesnis terminas - specialieji terminai siauresnis terminas - alantojo ertmė siauresnis terminas - alantojo ... allantois - [ə lan′tō is] n. pl. allantoides [al΄ən tō′ə dēz΄] [ModL < Gr allantoeidēs, sausage shaped < allas, sausage ( ... Allantois - Eröffnete Gebärmutter einer Katze mit einem Fötus in der Mitte der Trächtigkeit. 1 Nabel, 2 Amnion, 3 Allantois, 4 ... Allantois - Infobox Embryology Name = Allantois Latin = GraySubject = 12 GrayPage = 54 Caption = Diagram illustrating early ...
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BIOETYMOLOGY : ORIGIN IN BIOMEDICAL TERMS: allantois
Sedum allantoides - Roraima Nursery
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Chorion | embryology | Britannica.com
Early detection and staging of spontaneous embryo resorption by ultrasound biomicroscopy in murine pregnancy. - PubMed - NCBI
E) Day 8. Embryo with amnion and allantois. (F) Day 9. The hyperechogenic decidua capsularis is stretched out at the ... Al - Allantois; Am - Amnion; DC - Decidua capsularis; EC - Embryonic cavity; Em - Embryo; GT - Giant trophoblasts; MH - ... Embryonic erythrocytes are absent in the allantois but maternal lyomphocytes, neutrophils and erythrocytes are present. (H) ... AA - Aortic arches; Al - Allantois; Am - Amnion; DB - Decidua basalis; DC - Decidua capsularis; Dec - Decidua; EC - Embryonic ...
Mapping Wnt/β-catenin signaling during mouse development and in colorectal tumors | PNAS
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Inhibition of trophoblast stem cell potential in chorionic ectoderm coincides with occlusion of the ectoplacental cavity in the...
Preparation of allantoises. Whole 4 somite pair (s.p.) and 8 s.p. allantoises were removed intact as described earlier (Downs ... In series 3, whole 4 s.p. and 8 s.p. allantoises as well as 4 s.p. allantois distal tips were isolated from conceptuses ... 5). Altogether, four cultures were established from whole 4 s.p. allantoises, six cultures from whole 8 s.p. allantoises and ... In series 1, allantoises that had not yet made physical contact with the ChE were removed from conceptuses by aspiration at the ...
Embryonic Lethality and Tumorigenesis Caused by Segmental Aneuploidy on Mouse Chromosome 11 | Genetics
Genesis of Species/III - Wikisource, the free online library
Category:Embryology - Wikimedia Commons
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Epiblast-specific Snai1 deletion results in embryonic lethality due to multiple vascular defects | BMC Research Notes | Full...
Similar vascular defects were observed in the mutant allantois explants. These studies demonstrate that lethality in the Snai1- ... we analyzed vascular remodeling in cultured allantois explants from the mutant embryos. ... VCAM1 and VE-cadherin expression in control and Snai1-cko allantois explants. (a-d) VCAM1-immunostained allantois explants ... Vascular morphogenesis in Snai1-cko allantois and allantois explants plated on collagen. (a, b) Histological sections of PECAM- ...
005032 - B6 x B6Ei.129(Cg)-Bmp8b|tm1Blh|/EiJ
small allantois(MGI Ref ID J:63160). *abnormal allantois morphology*allantois is more elongated at the headfold stage, but is ... absent allantois*Background Sensitivity - 25% of mice lack an allantois, N2-N6 backcross generation onto C57BL/6 ... delayed allantois development*no allantoic bud is seen at the late streak stage and only a small bud is present at the neural ...
Yolk16
- The human allantois is a caudal out-pouching of the yolk sac, which becomes surrounded by the mesodermal connecting stalk known as the body-stalk. (wikipedia.org)
- The embryonic allantois becomes the fetal urachus, which connects the fetal bladder (developed from cloaca) to the yolk sac. (wikipedia.org)
- Between the 5th and 7th week of development, the allantois will become the urachus, a duct between the bladder and the yolk sac. (wikipedia.org)
- Opened uterus with cat fetus in midgestation: 1 umbilicus, 2 amniotic sac (chorion and amnion), 3 allantois, 4 Yolk sac, 5 developing marginal hematoma, 6 maternal part of placenta (endometrium) Ultrasound of fetus showing urachus duct from bladder to the umbilicus. (wikipedia.org)
- Inside, the amnion encloses the embryo in a protected, moist environment in which nourishment is supplied by the yolk sac, and metabolic waste is stored by the allantois . (wordnik.com)
- It was known by the 1860's that various nutritive, respiratory, and excretory organs (yolk-sac, allantois ) characteristic of embryos are lacking in all adults. (wordnik.com)
- The allantois grows rapidly and within ten days completely surrounds the embryo and yolk sac and fills the extra-embryonic coelom between the amnion and chorion. (yourarticlelibrary.com)
- allantois - A fetal membrane developing from the hindgut (or yolk sac, in humans). (enacademic.com)
- What are the functions of the allantois and yolk sac in birds? (bartleby.com)
- In the ---week the yolk sac forms the allantois, ----week obliteration of vitelline duct. (brainscape.com)
- A tiny diverticulum called the allantois appears in the caudal wall of the secondary yolk sac. (ehd.org)
- The extraembryonic membranes that may be present in vertebrates are the yolk sac , the amnion , the chorion , the allantois and the placenta . (biology-questions-and-answers.com)
- In reptiles and birds , in addition to the yolk sac, the amnion, the chorion and the allantois are also present. (biology-questions-and-answers.com)
- The chorion is the membrane that covers the amnion , the yolk sac and the allantois . (biology-questions-and-answers.com)
- However, transmission electron microscopy evidenced high metabolic rate in chorion and allantois, and high secretion profile in amnion and even higher in yolk sac. (bireme.br)
- Posteriorly, the allantois has formed and is growing into the exocoelomic cavity, whose formation is now complete and comprised of the chorion (roof), the yolk sac (walls) and amnion (floor). (els.net)
Embryo7
- The function of the allantois is to collect liquid waste from the embryo, as well as to exchange gases used by the embryo. (wikipedia.org)
- In some mammals, including humans, the allantois is vestigial and may regress, yet the homologous blood vessels persist as the important umbilical arteries and veins connecting the embryo with the placenta. (thefreedictionary.com)
- It provides an additional 'protective umbrella' over the embryo and serves for respiration in association with the allantois. (yourarticlelibrary.com)
- The nitrogenous wastes of the embryo are passed into the hind gut (cloaca) near its base by the Wolffian ducts, thence they pass into the allantois. (yourarticlelibrary.com)
- 14. The embryo has an amnion and allantois. (powells.com)
- Diagram of a longitudinal section through the embryo of a fowl, showing formation of amnion and allantois and the relation of these membranes to the embryo. (usf.edu)
- The allantois is the extraembryonic membrane whose function is to store excretions of the embryo. (biology-questions-and-answers.com)
Placenta2
- In placental mammals, the allantois is present but it does not exert that function, since embryonic wastes are collected by the mother's body through the placenta . (biology-questions-and-answers.com)
- Layered membranes are on the fetal side of the placenta: the allantois, amnion, and chorion. (icr.org)
Membrane4
- The splanchnic mesoderm is pushed out with the diverticulum and form with it, the fourth embryonic membrane called allantois. (yourarticlelibrary.com)
- To compensate for this, the chorion and the allantois fuse together to form the chorioallantoic membrane . (wikipedia.org)
- The allantois shrinks to become the chorioallantoic membrane. (thepoultrysite.com)
- The chorioallantois membrane is formed by juxtaposition of certain regions of the chorion and the allantois . (biology-questions-and-answers.com)
Umbilical cord2
- In placental mammals, the allantois is part of and forms an axis for the development of the umbilical cord. (wikipedia.org)
- The allantois remains connected to the hindgut by a narrower allantoic stalk which runs through the umbilical cord. (thefreedictionary.com)
Membranes3
- The allantois, along with the amnion and chorion (other extraembryonic membranes), identify humans and other mammals as well as reptiles (including birds) as amniotes. (wikipedia.org)
- Aristotle's view, arguing that the female seed contrib - utes only nutrition and the allantois , while the male seed forms the other embryonic membranes (chorion, amnion) and bodily parts. (wordnik.com)
- The allantois eventually fuses with the overlying chorion to form the compound chorioallantois, which lies just below the shell membranes in reptiles and birds. (thefreedictionary.com)
Urachus4
- In early fetal development, the ventral cloaca (precursor of the urinary bladder) is connected to the allantois via the urachus, which undergoes progressive involution, resulting in an obliterated, fibrous cord by 32 weeks' gestation. (thefreedictionary.com)
- The urachus is an embryonic connection between the urinary bladder and the allantois. (hindawi.com)
- The urachus is a vestigial remnant of at least two embryonic structures: the cloaca, and the allantois. (hindawi.com)
- The urachus represents the remnant of either the cloaca or the allantois [2]. (urotoday.com)
Hindgut1
- In early embryos, the entodermally lined chamber into which the hindgut and allantois empty. (dictionary.com)
Fetal2
- Fetal liver kinase (Flk1)-positive angioblasts were significantly decreased in T C /T C allantoises and did not coalesce into endothelial tubules, possibly as a result of the absence of platelet endothelial cell adhesion molecule 1 (Pecam1), whose spatiotemporal relationship to Flk1 suggested a role in patterning the umbilical vasculature. (biologists.org)
- In addition, visceral endoderm bifurcates into the allantois where, with the primitive streak, it organizes the nascent umbilical artery and promotes allantoic elongation to the chorion, the site of fetal‐maternal exchange. (wiley.com)
Cloaca1
- The allantois , _al_, extends cephalad for some distance from the floor of the cloaca. (wordnik.com)
Embryos4
- To determine whether the observed vascular defects were dependent on disruption of blood flow, we analyzed vascular remodeling in cultured allantois explants from the mutant embryos. (biomedcentral.com)
- The allantois was dissected from E8.5 mouse embryos using tungsten needles, and was placed individually on collagen or fibronectin-coated coverslips in 8-well culture dishes (BD Biocoat). (biomedcentral.com)
- The allantois (white arrow) appeared short and swollen and failed to fuse to the chorion in mutant embryos. (asm.org)
- The allantois is an adaptation to dry land because in embryos of oviparous terrestrial organisms, such as reptiles and birds, metabolic wastes cannot be immediately excreted to aquatic surroundings (like fish and amphibian larvae do). (biology-questions-and-answers.com)
Placental2
- Through contact with the streak, associated visceral endoderm undergoes an epithelial‐to‐mesenchymal transition, contributing extraembryonic mesoderm to the placental arterial vasculature, and to the allantois, or pre‐umbilical tissue. (wiley.com)
- Based on these new insights at the posterior embryonic‐extraembryonic interface, we conclude by asking whether so‐called primordial germ cells are truly antecedents to the germ line that segregate within the allantois, or whether they are placental progenitor cells. (wiley.com)
Vitelline1
- In the specimen examined presented vestige of allantois sack and vitelline sack in these gestational phase. (scielo.cl)
Fuse2
- Also, most marsupial allantoises do not fuse with the chorion. (wikipedia.org)
- Mouse conceptuses homozygous for mutations in brachyury ( T ) exhibit a short, misshapen allantois that fails to fuse with the chorion. (biologists.org)
Body stalk2
- Allantois - Infobox Embryology Name = Allantois Latin = GraySubject = 12 GrayPage = 54 Caption = Diagram illustrating early formation of allantois and differentiation of body stalk. (enacademic.com)
- Diagram illustrating early formation of allantois and differentiation of body-stalk. (wikipedia.org)
Urachal1
- A patent allantois can result in urachal cyst. (wikipedia.org)
E8.51
- F) Malformation of the allantois at E8.5. (asm.org)
Mesodermal2
- The mouse allantois consists of mesodermal tissue, which undergoes vasculogenesis to form the mature umbilical artery and vein. (wikipedia.org)
- Thus in many mammals the mesodermal part of the allantois often appears long before the endodermal part, though this is phylogenetically older. (wordnik.com)
Vascularization1
- Growth of the allantois and increased vascularization of the vitellus. (thepoultrysite.com)
Urinary bladder1
- The main purpose of allantois is to store nitrogenous wastes, thus functioning as embryonic urinary bladder. (yourarticlelibrary.com)
Birds2
- In birds and reptiles the allantois acts as a respiratory surface with the allantoic cavity (see Fig. 30 being used for the storage of excretory materials. (thefreedictionary.com)
- In reptiles and birds it fuses with the allantois . (britannica.com)
Vascular3
- It is an interesting point that this vascular hood, called the allantois , is represented in the Amphibians by an unimportant bladder growing out from the hind end of the food-canal. (wordnik.com)
- The allantois is highly vascular and serves for respiratory exchanges. (yourarticlelibrary.com)
- Similar vascular defects were observed in the mutant allantois explants. (biomedcentral.com)
Allas1
- Anc Greek αλλάs /allas(=saugage), genitive άλλαντος /allantos because allantois resembles to sausage. (blogspot.com)
Allantoid1
- Allantois - Al*lan to*is, Allantoid Al*lan toid, ] n. (enacademic.com)
Germ1
- The primordial germ cells (not shown) are forming near the base of the allantois. (els.net)
Fuses1
- An exception is the allantois of the bandicoot, which has a vasculature, and fuses with the chorion. (wikipedia.org)
Diagram1
- Some other structures that we have associated with this, that aren't directly labeled on this diagram are the allantois. (sophia.org)
Vessels1
- In most marsupials, the allantois is avascular, having no blood vessels, but still serves the purpose of storing nitrogenous (NH3) waste. (wikipedia.org)
Function1
- T protein was recently identified in several new sites during mouse gastrulation, including the core of the allantois, where its function is not known. (biologists.org)
Oxygen1
- Oxygen is absorbed by the allantois through the egg shell. (wikipedia.org)
Development1
- During the third week of development, the allantois protrudes into the area of the urogenital sinus. (wikipedia.org)
Early1
- A very early condition of Man, with yelk-sac, allantois , and amnion (original). (wordnik.com)