A layer of cells lining the fluid-filled cavity (blastocele) of a BLASTULA, usually developed from a fertilized insect, reptilian, or avian egg.
The developmental entity of a fertilized egg (ZYGOTE) in animal species other than MAMMALS. For chickens, use CHICK EMBRYO.
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.
A small whitish spot on the surface of the EGG YOLK where cleavage begins. Upon fertilization the cytoplasm streams from the vegetal pole away from the yolk to the animal pole where cleavage will occur. This germinal area eventually flattens into a layer of cells (BLASTODERM) that covers the yolk completely.
The processes occurring in early development that direct morphogenesis. They specify the body plan ensuring that cells will proceed to differentiate, grow, and diversify in size and shape at the correct relative positions. Included are axial patterning, segmentation, compartment specification, limb position, organ boundary patterning, blood vessel patterning, etc.
Gene Expression Regulation, Developmental
The development of anatomical structures to create the form of a single- or multi-cell organism. Morphogenesis provides form changes of a part, parts, or the whole organism.
Common name for two distinct groups of BIRDS in the order GALLIFORMES: the New World or American quails of the family Odontophoridae and the Old World quails in the genus COTURNIX, family Phasianidae.
Fushi Tarazu Transcription Factors
Cells in certain regions of an embryo that self-regulate embryonic development. These organizers have been found in dorsal and ventral poles of GASTRULA embryos, including Spemann organizer in amphibians, and Hensen node in chicken and mouse. These organizer cells communicate with each other via a network of secreted signaling proteins, such as BONE MORPHOGENETIC PROTEINS and their antagonists (chordin and noggin).
Nodal Signaling Ligands
Members of the transforming growth factor superfamily that play a role in pattern formation and differentiation during the pregastrulation and GASTRULATION stages of chordate development. Several nodal signaling ligands are specifically involved in the genesis of left-right asymmetry during development. The protein group is named after a critical region of the vertebrate embryo PRIMITIVE STREAK referred to as HENSEN'S NODE.
Cleavage Stage, Ovum
The earliest developmental stage of a fertilized ovum (ZYGOTE) during which there are several mitotic divisions within the ZONA PELLUCIDA. Each cleavage or segmentation yields two BLASTOMERES of about half size of the parent cell. This cleavage stage generally covers the period up to 16-cell MORULA.
Hormones secreted by insects. They influence their growth and development. Also synthetic substances that act like insect hormones.
A linear band of rapidly proliferating cells that begins near the posterior end of an embryo and grows cranially. Primitive streak is formed during GASTRULATION by the convergent migration of primary ectodermal cells (EPIBLAST). The knot at the tip of the streak is called HENSEN NODE.
Encyclopedias as Topic
The inner of the three germ layers of an embryo.
Highly specialized EPITHELIAL CELLS that line the HEART; BLOOD VESSELS; and lymph vessels, forming the ENDOTHELIUM. They are polygonal in shape and joined together by TIGHT JUNCTIONS. The tight junctions allow for variable permeability to specific macromolecules that are transported across the endothelial layer.
The outer margins of the ABDOMEN, extending from the osteocartilaginous thoracic cage to the PELVIS. Though its major part is muscular, the abdominal wall consists of at least seven layers: the SKIN, subcutaneous fat, deep FASCIA; ABDOMINAL MUSCLES, transversalis fascia, extraperitoneal fat, and the parietal PERITONEUM.
An order of heavy-bodied, largely terrestrial BIRDS including pheasants, TURKEYS, grouse, QUAIL, and CHICKENS.
Terminology as Topic
Dictionaries as Topic
Aurora kinase A controls meiosis I progression in mouse oocytes. (1/6)Aurora kinase A (AURKA), which is a centrosome-localized serine/threonine kinase crucial for cell cycle control, is critically involved in centrosome maturation and spindle assembly in somatic cells. Active T288 phosphorylated AURKA localizes to the centrosome in the late G(2) and also spreads to the minus ends of mitotic spindle microtubules. AURKA activates centrosomal CDC25B and recruits cyclin B1 to centrosomes. We report here functions for AURKA in meiotic maturation of mouse oocytes, which is a model system to study the G(2) to M transition. Whereas AURKA is present throughout the entire GV-stage oocyte with a clear accumulation on microtubule organizing centers (MTOC), active AURKA becomes entirely localized to MTOCs shortly before germinal vesicle breakdown. In contrast to somatic cells in which active AURKA is present at the centrosomes and minus ends of microtubules, active AURKA is mainly located on MTOCs at metaphase I (MI) in oocytes. Inhibitor studies using Roscovitine (CDK1 inhibitor), LY-294002 (PI3K inhibitor) and SH-6 (PKB inhibitor) reveal that activation of AURKA localized on MTOCs is independent on PI3K-PKB and CDK1 signaling pathways and MOTC amplification is observed in roscovitine- and SH-6-treated oocytes that fail to undergo nuclear envelope breakdown. Moreover, microinjection of Aurka mRNA into GV-stage oocytes cultured in 3-isobutyl-1-methyl xanthine (IBMX)-containing medium to prevent maturation also results in MOTC amplification in the absence of CDK1 activation. Overexpression of AURKA also leads to formation of an abnormal MI spindle, whereas RNAi-mediated reduction of AURKA interferes with resumption of meiosis and spindle assembly. Results of these experiments indicate that AURKA is a critical MTOC-associated component involved in resumption of meiosis, MTOC multiplication, proper spindle formation and the metaphase I-metaphase II transition. (+info)
The position of the germinal vesicle and the chromatin organization together provide a marker of the developmental competence of mouse antral oocytes. (2/6)(+info)
Examining the contents of isolated Xenopus germinal vesicles. (3/6)(+info)
Mammalian nuclear transplantation to Germinal Vesicle stage Xenopus oocytes - a method for quantitative transcriptional reprogramming. (4/6)(+info)
Inhibition of germinal vesicle breakdown by antioxidants and the roles of signaling pathways related to nitric oxide and cGMP during meiotic resumption in oocytes of a marine worm. (5/6)(+info)
A survey of 6,300 genomic fragments for cis-regulatory activity in the imaginal discs of Drosophila melanogaster. (6/6)(+info)
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The epiblast, a single epithelial layer blastodisc, is the source of all embryonic material in amniotes and some of its ...
The embryo forms a disc of cells, called a blastodisc, on top of the yolk. Discoidal cleavage is commonly found in monotremes, ...
Blastodisc | Article about Blastodisc by The Free Dictionary
The blastodisc contains a nucleus and is free... Explanation of Blastodisc ... Find out information about Blastodisc. embryonic disc, an aggregate of cytoplasm in the holozoic part of the ovum in animals ... Related to Blastodisc: blastoderm. Blastodisc. embryonic disc, an aggregate of cytoplasm in the holozoic part of the ovum in ... The blastodisc contains a nucleus and is free from the yolk. In the process of cleavage the blastodisc is transformed into a ...
Primitive streak - Wikipedia
Vasculogenesis in the early quail blastodisc as studied with a monoclonal antibody recognizing endothelial cells at eagle-i...
Hatchability Problem Analysis | BackYard Chickens
The blastodisc (arrow) deteriorated but still has the characteristic shape and size of a typical fertile blastodisc.. ... Fertilized blastodisc; the embryo has about 50,000 cells when the egg is laid.. hatch, percent hatch, hatching percent, hatch ... blastodisc. The small disc-shaped region on the yolk that contains the egg nucleus.. blood ring. Circular blood remnant visible ... fertile, no development (FND). Rarely diagnosed condition in which the blastodisc was fertilized but died before the egg was ...
Peritoneal Carcinomatosis From Yolk Sac Tumor in a Postmenopausal Woman Following Chemotherapy for High-grade Ovarian Serous...
Embryonic shield | Definition of Embryonic shield at Dictionary.com
Modulation of F-actin dynamics by maternal Mid1ip1L controls germ plasm aggregation and furrow recruitment in the zebrafish...
... animal with blastodisc center to the left and blastodisc periphery to the right). F-actin arcs, associated with RNP aggregates ... A′-C′ highlight the region of F-actin arcs (white double-headed arrows) and the distance from the center of the blastodisc to ... We find an association of germ plasm RNP aggregates with cortical F-actin trenches at the blastodisc cortex, as well as F-actin ... H) Quantification of cortical actin clearance as the ratio of the distance from the center of the blastodisc to the region of ...
Introductory Zoology Slide Set
Blastodisc. Amphiuma intestine, c.s. Frog blastula, sec. Human blood, smear. Wright stain. Mammalian muscle-three types, sec. ...
Breakout Analyses Guide for Hatcheries | The Poultry Site
The blastodisc appears as more of a small, intense white spot on the surface of the yolk. Sometimes the blastodisc is ... There are some cases when the embryo or the blastodisc will not appear on the top of the yolk. When this occurs, rotate the egg ... The blastodisc (indicating infertility) is rarely perfectly round, and has jagged edges. There are usually more vacuoles ( ... Size: The blastoderm is almost always larger in appearance (one- quarter to one-third larger) than the blastodisc. ...
The artificial propagation of warm-water finfishes A manual for extension
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Studies on the reproductive and developmental biology of Cichlasoma dimerus (Percifomes, Cichlidae)
... blastodisc; bl, blastoderm; e, eye; ea, embryonic axis; fv, finfold vessels; g, gills; h, heart; i, intestine; m, melanophores ... giving rise to a prominent dome-shaped cytoplasmic layer known as the blastodisc (Fig. 2A). ...
Microtubule arrays during ooplasmic segregation in the medaka fish egg (Oryzias latipes). - Free Online Library
At [T.sub.n] = 1.0, the blastodisc divides into two blastomeres. By this time the oil droplets have formed a crude ring around ... In these eggs, the blastodisc has begun to divide into two blastomeres, and essentially all oil droplets have aggregated in a ... Each of these blastomeres had a microtubule-organizing center (data not shown) similar to the one present in the blastodisc ... Scanning electron microscopy studies on blastodisc formation in the zebrafish, Brachydanio rerio. J. Morphol. 184: 41-49. ...
Environmental influences on reproductive potential, clutch viability and embryonic mortality of the American alligator in...
Presence of blastodiscs at one pole and at the uppermost surface suggest a time. frame for migration. The movement of the ... blastodiscs were found at either the uppermost surface or a pole in eggs that did not. band, suggesting that mortality of ... had an identifiable blastodisc. Therefore, the most appropriate status for those 6. specimens is unknown, not infertile.. ... only six of the 376 did not have a macroscopically visible blastodisc present.. However, those 6 eggs were among 67 eggs which ...
List of common anatomical and physiological terms
Vascular endothelial cell lineage-specific promoter in transgenic mice | Development
1994) Induction of vasculogenesis in quail blastodisc-derived embryoid bodies. Dev. Biol 164, 123-132. ...
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Mitosis features color illustrations and photomicrographs (3,100x) of whitefish blastodisc and onion root tip. Meiosis features ... Mitosis features color illustrations and photomicrographs (3,100x) of whitefish blastodisc and onion root tip. Meiosis features ... Mitosis features color illustrations and photomicrographs (3,100x) of whitefish blastodisc and onion root tip. Meiosis features ...
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Inject the premeasured drop (100 μm corresponding to 0.5 nl) under a stereoscope through the chorion into the blastodisc17, ... This is often needed to find the blastodisc and the optimal penetration angle. ... The site for injection is the blastodisc (asterisk), formed by cytoplasmic streams from the yolk (arrow) that defines the ... the injection into the blastodisc (Figure 1A, asterisk) requires more experience and training. Critical during this procedure ...
celf1 - CUGBP Elav-like family member 1 - Danio rerio (Zebrafish) - celf1 gene & protein
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Pardanaud, L., Altmann, C., Kitos, P., Dieterlen-Lièvre, F. and Buck, C. (1987). Vasculogenesis in the early quail blastodisc ...
- In the process of cleavage the blastodisc is transformed into a layer of cells (blastoderm) located on the surface of the nondividing yolk. (thefreedictionary.com)
- There are usually more vacuoles (bubbles) present in the periphery of the blastodisc than the blastoderm (Plate 2). (thepoultrysite.com)
- Size: The blastoderm is almost always larger in appearance (one- quarter to one-third larger) than the blastodisc. (thepoultrysite.com)
- Color Intensity: The blastoderm almost always appears to be a less intense color of white than the blastodisc. (thepoultrysite.com)
- The ovum is often referred to as the blastodisc , blastoderm or germ disc . (poultryhub.org)
- the layer of cells formed by cleavage of the fertilized egg in the presence of large amounts of yolk, e.g. in birds, so that the blastoderm forms on one side of the yolk mass, initially as a small blastodisc. (thefreedictionary.com)
- The teleost egg has blastoderm in the form of blastodisc, the cleavage is meroblastic, i.e., limited to blastodisc, the entire zygote is not divided. (simmme.com.br)
- Technically speaking, fertile eggs are where the 'blastodisc' turns into a 'blastoderm' - the first stage of a developing embryo. (backyardchickencoops.com.au)
- If your rooster sperm fertilizes it, then cell division and embryo development begins and transforms the blastodisk into what we call a blastoderm. (sofreshchickens.com)
- However, whether or not it is fertilized, the yolk, now known as a blastodisk or blastoderm flows down the magnum and isthmus parts of the oviduct. (sofreshchickens.com)
- In epiboly, cells at the animal pole (termed the blastoderm or blastodisc in fish) spread out and expand to cover the yolk at the vegetal pole (in amphibians, yolk-filled cells are covered instead). (studentreader.com)
- 3. In fertile eggs the blastoderm is in bullseye form and develops into an embryo while in infertile eggs the blastodisc is in an irregular shape. (typesofchicken.com)
- When the egg is fertile the blastodisk becomes known as the blastoderm. (typesofchicken.com)
- The only 100% sure way to check if an egg fertile is to break the egg and identify the blastodisc or the blastoderm we mentioned above. (typesofchicken.com)
- Growth of the Embryo: The fertilized blastodisc (now called the blastoderm) grows and becomes the embryo. (blogspot.com)
- The blastodisc contains a nucleus and is free from the yolk. (thefreedictionary.com)
- The blastodisc appears as more of a small, intense white spot on the surface of the yolk. (thepoultrysite.com)
- B: The inner cell mass develops further into a two-layered structure, the blastodisc, containing the epiblast adjacent to the amnionic cavity and the hypoblast adjacent to the yolk sac. (medscape.com)
- In stage IA eggs, mechanical treatment resulted in scattered blastodiscs surrounded by single cells, while in further advanced stages the yolk membrane collapsed entirely, the yolk coagulated and the embryo extending over the yolk shrank. (uni-kiel.de)
- Formaldehyde fixation caused the yolk and the blastodisc or embryo to darken, and in some cases crystalline enclosures occurred. (uni-kiel.de)
- Introduction of embryos: before cleavage of the blastodisc commenced (approximately 2-4 hours after fertilisation). (europa.eu)
- The nucleated layer of cytoplasm that surrounds the blastodisk of an egg undergoing discoidal cleavage. (thefreedictionary.com)
- Five embryonic steps (blastodisc formation, cleavage, epiboly, organogenesis and blood circulation) and free embryo consisting of five larval steps were identified. (bvsalud.org)
- Mitosis features color illustrations and photomicrographs (3,100x) of whitefish blastodisc and onion root tip. (carolina.com)
- Whitefish Blastodisc Showing Mitosis, Section. (southernbiological.com)
- Examples used to illustrate the stages of Mitosis are taken from whitefish blastodisc for animal cells and onion. (southernbiological.com)
- Mitotic stages are represented by magnified images which allow students to observe clear cytological detail in the onion root tip and whitefish blastodisc. (interniche.org)
- We show that, in embryos mutant for the cytoskeletal regulator mid1ip1l , germ plasm RNPs fail to become recruited to the furrow, accumulating instead at the periphery of the blastodisc. (biologists.org)
- The epiblast , a single epithelial layer blastodisc , is the source of all embryonic material in amniotes  and some of its cells will give rise to the primitive streak. (wikipedia.org)
- Next, we performed blastodisc isolation assay to find the competent stage for embryonic manipulation. (agriculturejournals.cz)
- All of the eggs laid by the five virgin females, the four second-clutch females, and the three females allowed to mate with vasectomised males, were "collapsed" at oviposition, and none showed any sign of a blastodisc or its associated vascular rosette. (thefreedictionary.com)
- Thus, we conclude that unfertilised eggs of sand lizards are easily recognizable at laying: they lack turgot and lack blastodiscs and the associated vascularity. (thefreedictionary.com)
- marulius eggs, blastodisc divided after 35-60 min into two blastomeres. (thefreedictionary.com)
- In these eggs, the blastodisc has begun to divide into two blastomeres, and essentially all oil droplets have aggregated in a crude ring near the vegetal pole. (thefreedictionary.com)
- the blastodisk of yolky eggs. (dictionary.com)
- Composite of three sections of fish blastodisc and three sections of onion root tip. (wardsci.com)
- The blastodisc results from incomplete furrow formation. (studentreader.com)
- Blastodisc cap formation occurred in all embryos treated with 0. (thefreedictionary.com)
- That means it's fertile and the cells in the blastodisc have begun dividing. (backyardchickens.com)
- In amniote animal embryology, the epiblast is a tissue type derived either from the inner cell mass in mammals or the blastodisc in birds and reptiles. (riken.jp)
- These results suggest that the ordered movement of cytoplasm, which forms the blastodisc in the squid, is disturbed by cold treatment. (thefreedictionary.com)
- Where it has been studied, embryogenesis is arrested at the blastodisc stage and preserved in the uterus for periods from four to 10 months. (deepdyve.com)
- The nucleus of the egg is in the blastodisc. (davidelster.me)
- The blastodisc (indicating infertility) is rarely perfectly round, and has jagged edges. (thepoultrysite.com)
- In order to obtain chicks from in vitro application of semen on the ovum, Semen diluted 1 to 200 with Ringer's solution was poured on the blastodisc of the ova which were collected as described above. (nii.ac.jp)
- At the 1-cell stage (0.2 hpf), this transcript is relocated by streamers in the blastodisc area and equally partitioned among blastomeres. (omicsdi.org)
- These results suggest that a microtubule-associated mechanism is responsible for ooplasm segregation and blastodisc formation in the squid. (thefreedictionary.com)
- 2+] gradients near the poles, and to inhibit the formation of the blastodisc and the movement of oil droplets toward the vegetal pole (Fluck et al. (thefreedictionary.com)
- C: With further development, the blastodisc thickens cranially to form the prochordal plate. (medscape.com)
- This is a single female cell named a blastodisk. (sofreshchickens.com)
- At the cortex, this process attenuates microtubule-dependent outward RNP movement to retain RNPs in the blastodisc cortex and allow their recruitment to the furrows. (biologists.org)
- As in the blastodisc , the YSL division cycles lengthen during the midblastula period, but not as much, and the YSL nuclei continue to divide metasynchronously, not asynchronously. (zfin.org)
- Still, even for the so-called silk-enameled silk enamel, the blastodiscs determine the division of the color fragments of the iron wire and then disperse or destroy the blastocysts. (bossgust.com)