First stage of invagination, Biology

First Stage of Invagination

The large endodermal cells that are remaining in the vegetal plate move laterally towards the centre of the plate and fill the gap in the vegetal plate caused through the ingression of the primary mesenchyme cell. As a result, the vegetal plate turns into even more flattened. Soon thereafter the plate bends inwards (invagination) in the centre initiating the creation of a new cavity called the archenteron (primitive gut). Its opening at the vegetal pole is the blastopore. Invagination proceeds till the archenteron extends into the blastocoel about one third the distances among the vegetal and animal poles and then stops. The endodermal cells invaginate even if the vegetal plate is isolated and cultured in vitro pointing out that invagination occurs due to intrinsic properties of these cells and no external force is involved. Invagination possibly occurs as a result of constrictive activity of microfilaments at the outer ends of the cells of the vegetal plate.

Posted Date: 1/25/2013 5:03:35 AM | Location : United States







Related Discussions:- First stage of invagination, Assignment Help, Ask Question on First stage of invagination, Get Answer, Expert's Help, First stage of invagination Discussions

Write discussion on First stage of invagination
Your posts are moderated
Related Questions
How can coacervates be formed of phospholipids or polypeptides? Phospholipids are amphipathic molecules, i.e., they present a polar portion and a nonpolar portion. In contact w

Chemical bonding : The present matter of earth contains atoms bound in groups of two or more called molecules. Their binding capacity is called chemical reactivity; It depends upo

Define the Management of Epileptic Patients? The primary treatment of epilepsy is anticonvulsant drugs. The focus of nutritional management is a diet, which is appropriate for

Q. Investigations process of acute pericarditis? 1) Blood Examination Erythrocyte sedementaion rate (ESR) may be elevated in tuberculous; collagen and purulent pericarditis.

Why after the passage of animals from the aquatic to the terrestrial habitat does the abandonment of the ammoniotelic excretion occur? Ammonia is a highly toxic molecule if not

detail about cytoplas

how respiration takes place in mammls and reptiles

It is IgG mediated cytotoxic hypersensitivity. Typical manifestations contain erythroblastosis fetalis, hemolytic anemia, blood transfusion reactions etc.

Sporophytic Incompatibility The recognition and rejection reactions in a SSI system occur on the stigma surface, placing barriers for pollen germination or penetration of poll

Rehabilitation Phase for nutritional treatment - Neuro Trauma? Once the patient stabilizes and starts recovering, be sides nutritional replacement, there is a need to assess fu