Filter...

AnatomyOrganismsChemicals and DrugsAnalytical, Diagnostic and Therapeutic Techniques and EquipmentPhenomena and ProcessesInformation ScienceHealth Care

Select a category...

AllantoisYolk SacExtraembryonic MembranesChorionPrimitive StreakMesodermBlood VesselsEmbryo, MammalianGerm CellsEmbryonic and Fetal DevelopmentPlacentaT-Box Domain ProteinsAmnionCoturnixGene Expression Regulation, DevelopmentalIn Situ HybridizationEpitheliumGastrulaEmbryonic DevelopmentPregnancyReceptors, Growth FactorEncyclopedias as TopicReptilesDinosaursRadioactive Waste

Umbilical cordAmnionUrachusChorionYolk sacEmbryonicUrachal12th weekGestationDiverticulumEighth weekScrotumRemainsEarlyBloodIncludeAppearsDevelopmentDaysFormEmbryonic allantoisMedian umbilicaPlacentaEmbryoRemnantsAmnioticBudsMembraneBirdsGestationalGastrulationGrowsTissueHumanDorsalBodyStructureShellSecond weekLifeGrowth

Umbilical cord3

• In mammals excluding egg-laying monotremes, the allantois is one of the fetal membranes, and is part of and forms an axis for the development of the umbilical cord. (wikipedia.org)
• By week 7, the umbilical cord has fully formed, composed of the connecting stalk, vitelline duct, and u … Apr 28, 2021 · The umbilical cord is the vital connection between the fetus and the placenta. (teleplata.es)
• Allantoin is also produced in the allantois Gland of the umbilical cord (the link between mother and developing baby, which feeds the embryo) for promoting rapid cell growth. (dz-bz.com)

Amnion1

• Opened uterus with cat fetus in midgestation: 1 umbilicus, 2 amniotic sac (chorion and amnion), 3 allantois. (wikipedia.org)

Urachus2

• The embryonic allantois becomes the fetal urachus, which connects the fetal bladder (developed from cloaca) to the yolk sac. (wikipedia.org)
• During fetal development, the allantois becomes the urachus, a duct between the bladder and the yolk sac. (wikipedia.org)

Chorion3

• Also, most marsupial allantoises do not fuse with the chorion. (wikipedia.org)
• An exception is the allantois of the bandicoot, which has a vasculature, and fuses with the chorion. (wikipedia.org)
• A chorioallantoic membrane (CAM) is later formed from the chorion and allantois. (wikipedia.org)

Yolk sac2

• 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)
• Primordial germ cells migrate during the 5th week of gestation from the yolk sac along the hindgut and its dorsal mesentery towards the mesenchyme of the posterior body wall. (your-doctor.net)

Embryonic2

• PL: allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extraembryonic tissues). (wikipedia.org)
• During the third week of embryonic development, the allantois protrudes into the area of the urogenital sinus. (wikipedia.org)

Urachal1

• A patent allantois can result in a urachal cyst. (wikipedia.org)

12th week3

• It appears in the 5th week of development and becomes functional around the 12th week. (teachmeanatomy.info)
• By the 12th week, the mesonephric (Wolffian) duct is transformed into the vas deferens under the influence of testosterone. (your-doctor.net)
• During the 12th week, the testes descend to the inguinal canal and the suspensory ligament regresses. (your-doctor.net)

Gestation2

• Until 8 weeks' gestation, the human fetus is undifferentiated sexually and contains both male (wolffian) and female (müllerian) genital structures. (medscape.com)
• Prolonged gestation generally exceeds normal gestation by between 3 weeks and 3 months. (merckvetmanual.com)

Diverticulum2

• This diverticulum is seen first uring the fourth week, and grows from behind forwards, dorsal to the body cavity. (co.ma)
• contains the rudimentary allantoic diverticulum and represents the much more highly developed allantois of other forms, it would, perhaps, be better to term it the allantoic stalk. (co.ma)

Eighth week1

• The renal corpuscles arising in this manner are found in the human kidney, as early as the eighth week. (co.ma)

Scrotum2

• By the 28th week, there is an outgrowth from the gubernaculum that passes through the external ring and enters the scrotum. (your-doctor.net)
• It is hollowed out by a tongue of peritoneum (processus vaginalis), that allows the testes to descend into the scrotum by 33 weeks. (your-doctor.net)

Remains1

• While the function of the allantois remains conserved, there is a divergence in the characteristics of the allantois among mammalian species. (wikipedia.org)

Early3

• In mammals, the emergence of the allantois varies during early development. (wikipedia.org)
• In both pigs and rabbits, the allantois arises at early somite stages. (wikipedia.org)
• This early system is non-functional and regresses completely by the end of week 4. (teachmeanatomy.info)

Blood3

• In most marsupials, the allantois is avascular, having no blood vessels, but still serves the purpose of storing nitrogenous (NH3) waste. (wikipedia.org)
• Because the allantois can be cultured ex vivo, it has utility as a model system for studying the formation of blood vessels as well as considerable usefulness in drug screening. (wikipedia.org)
• The roof of the blood firom the allantois and ie surface exposed as long tendon of the chin. (wildwoodclinic.com)

Include1

• Structural variations of the allantois include differences in size and shape. (wikipedia.org)

Appears2

• In humans, the allantois appears during the presomitic stages of mid-gastrulation. (wikipedia.org)
• The pronephros appears in the 4th week of development. (teachmeanatomy.info)

Development1

• During the 6th week, cells of the genital ridge invade the mesenchyme to form primitive sex cords, consisting of cortical and medullary regions that will eventually invest the germ cells and support their development. (your-doctor.net)

Days1

• Shipping begins 24 to 36 hours after order is placed, delivery takes about a week to 15 days depending on the type of product you purchase. (koreabeautycosmetics.shop)

Form1

• The mouse allantois consists of mesodermal tissue, which undergoes vasculogenesis to form the mature umbilical artery and vein. (wikipedia.org)

Embryonic allantois1

• The umbilical veins arise from a convergence of venules that drain the extra‐embryonic allantois. (onteenstoday.com)

Median umbilica1

• A patent urachus represents the failure of the entire course of the fetal allantois to involute into the median umbilical ligament. (radiopaedia.org)

Placenta1

• The allantois and placenta exhibit high levels of c-ski mRNAs. (nih.gov)

Embryo2

• 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)
• A wedge of mesoderm, the urorectal septum , moves caudally towards the cloacal membrane as the embryo grows and folds during weeks 4-7 (Figure 33.5). (pediagenosis.com)

Remnants1

• Remnants of the allantois can be seen on the chick for up to 3 days after hatching, but after day 0 it is desiccated and thread-like. (raptorresource.org)

Amniotic3

• The cranial end will become the mouth and is sealed by the buccopharyngeal membrane , which will break in the fourth week, opening the gut tube to the amniotic cavity. (pediagenosis.com)
• The cloacal membrane ruptures in the seventh week, opening the gut tube to the amniotic cavity. (pediagenosis.com)
• surrounds the allantois and is a thin, tough membrane filled with amniotic fluid. (preparingtobecome.com)

Buds1

• The allantois buds from the hindgut and grows into the body stalk. (medscape.com)

Membrane1

• The caudal end will become the anus and is sealed by the cloacal membrane , which will break during the seventh week. (pediagenosis.com)

Birds2

• In most reptiles and birds, the allantois consists of extraembryonic endoderm enclosed in mesodermal tissue. (wikipedia.org)
• He published researches upon the formation of the egg in birds and fowls, upon the gradual unfolding of the allantois in the incubated egg, upon the increase of the young as the albumen diminishes, upon the structure and growth of feathers, upon the envelopes of the foetus of mammalia and of the human foetus, and upon the growth of vegetables and insects. (google.cz)

Gestational2

• CASE PRESENTATION: Case 1: A Japanese girl was born at a gestational age of 37 weeks, weighing 2550 g. (bvsalud.org)
• Case 2: A Japanese boy was born at a gestational age of 40 weeks, weighing 3502 g. (bvsalud.org)

Gastrulation2

• In humans, the allantois appears during the presomitic stages of mid-gastrulation. (wikipedia.org)
• The Third Week: Gastrulation. (medicscenter.com)

Grows1

• This diverticulum is seen first uring the fourth week, and grows from behind forwards, dorsal to the body cavity. (co.ma)

Tissue1

• The mouse allantois consists of mesodermal tissue, which undergoes vasculogenesis to form the mature umbilical artery and vein. (wikipedia.org)

Human1

• so that, for the first 6 weeks, the known ages of Macacus rhesus may be transferred to human embryos of corresponding developmental stages. (edu.au)

Dorsal1

• Part of the foregut tube begins to dilate in week 4, the dorsal side growing faster than the ventral side until week 6. (pediagenosis.com)

Body1

• On the day of hatching the area of the body where the allantois is attached is swollen, circular shaped and somewhat protruding. (raptorresource.org)

Structure1

• PL: allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extraembryonic tissues). (wikipedia.org)

Shell1

• Oxygen is absorbed by the allantois through the egg shell. (wikipedia.org)

Second week1

• Going into the second week of life, the young nestlings start to become more curious though still completely dependent on their parents for warmth and protection against the elements. (raptorresource.org)

Life1

• It usually presents after the first week of life but may present in any age. (abstractarchives.com)

Growth2

• For the first couple of days after hatch, they will be confined to the egg cup but by the end of that first week their growth will have started. (raptorresource.org)
• The midgut re‐enters the abdomen in week 10, and it is thought that growth of the abdomen together with regression of the mesonephric kidney and a reduced rate of liver growth are important factors in this occurring normally. (pediagenosis.com)