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
Illustrate the diabetic contract of the eye? Diabetic Cataract: 1) Sorbitol Aldose Pathway: In patients with diabetes, there is increase in sugar alcohol which results in

Define Carbohydrates Requirements in Human Body? Carbohydrates: High carbohydrate diets are beneficial at HA. The advantage of high carbohydrate diet is that respiratory quo

J-shape d - It shows 2 phases - (i) Lay phase (ii) Exponential phase

Mrs. TT seventy three-year old has a long history of chronic obstructive pulmonary disease (COPD). She came to the medical ward as shortness of breath, wheezing and a cough for the

Define plasma as Fluid Compartment - extracellular fluid? Plasma is the only major fluid compartment that exists as real collection of fluid all in one location. It differs fro

Vitamins Vitamins, as you may already know, derive its name from the word 'Vital Amine'. These are the organic compounds required for normal metabolism, growth and developme

What is shunts in Congenital Heart Surgery? Shunts : Blalock Shunts are connections between systemic arteries such as a subclavian arteiy with its respective pulmonary arteiy

Define Reagent for Determination of Blood Glucose by Nelson Somogyi? 1. Alkaline copper reagent a) Dissolve 15 g of sodium potassium tartarate and 30 g of anhydrous N

Define the metabolism and respiration of cornea. Metabolism and Respiration of Cornea The cornea requires energy for the maintenance of its transparency. Energy in

Q. Explain Intraoral Barrier Techniques? Rubber dam A rubber dam is used whenever possible for improved vision and access and to reduce dental personnels' exposure to micr