Formation and role of hypoblast, Biology

Formation and Role of Hypoblast

Hypoblast is made as a result of two processes. First, some cells individually leave the blastoderm and move down via poly invagination into the sub-germinal space to make a thin layer. Soon thereafter this layer is joined through a sheet of cells which separates from the posterior marginal one of the blastoderm and moves anteriorly in the sub-germinal cavity. So hypoblast formed expands and spreads peripherally to provide rise to complete thin layers below the remaining part of blastoderm now termed as the epiblast. The hypoblast and epiblast are joined together at the margin of area opaca and the space among them is the blastocoel.

The structure of the embryo is now somewhat identical to that of the frog blastula but the hypoblast is not the precursor of ectoderm, mesoderm or endoderm. It is later displaced through endodermal cells derived from epiblast. Hypoblast contributes cells for parts of some embryonic membranes but none at all for the creation of the body of the embryo. Though, the hypoblast has an important role in development of the embryo. Its removal at an early stage stops all further development until a new hypoblast is regenerated from the epiblast. Hypoblast induces the creation of the primary embryonic axis (the primitive streak) in the epiblast and determines its orientation.

Posted Date: 1/25/2013 5:32:33 AM | Location : United States







Related Discussions:- Formation and role of hypoblast, Assignment Help, Ask Question on Formation and role of hypoblast, Get Answer, Expert's Help, Formation and role of hypoblast Discussions

Write discussion on Formation and role of hypoblast
Your posts are moderated
Related Questions
What is extracellular digestion? Extracellular digestion is that in which food breaking into utile molecules that can be internalized by the cell is completed in the extracellu

Explain about the Thermoplastic Extrusion? This is a major technique used for vegetable proteins at present. Thermoplastic extrusion leads to dry fibrous and porous granules or

in natural vegetative propagation which structure gives rise to new individuals?

Bleeding on Probing (BOP) BOP when elicited (notated in patient record as BOP +) after the insertion of a probe into the sulcus with light pressure i.e. 25 N has been shown to

Q. What are the major harms caused by vitamin A deficiency? How does this vitamin act in the physiology of vision? Deficiency of vitamin A (retinol) may corneal dryness (xeroph

LYSOSOMES Like mitochondrial lysosomes are also  typical membrane bound and dense  fluid filled sac  like cytoplasmic  organelles  of all eukaryotic cells these  however, diffe

Explain Entecavir  Entecavir  (Baraclude) taken orally once a day as monotherapy appears to be superior to lamivudine for patients with chronic HBV infection, but susceptibili

Antioxidants  Antioxidants are the substances that can delay onset, or  slow the rate of oxidation of autoxidizable materials. By virtue of this property,  they provide protect

typical growth curve in plants

Determine the Objectives of Economic Evaluation? There are two objectives of economic evaluation. These are: 1) To introduce resource consideration into analysis and to asse