Epiboly of ectoderm, Biology

Epiboly of Ectoderm

Like the presumptive endodermal notochordal and mesodermal cells migrate inward the areas in the epiblast vacated through them are occupied by expansion (epiboly) of the embryonic epidermal and neural ectoderm. At the same time with gastrulation the ectodermal cells expand as a sheet beneath the vitelline membrane outward from the area opaca finally encircling the yolk. The upper surfaces of ectodermal cells of area opaca are in from contact with the inner surface of vitelline membrane and they spread along this inner surface of the membrane. Also, these cells extend pseudopodia processes which attach to inner side of the vitelline membrane. It appears that these marginal cells of area opaca migrate outward along the inner surface of the vitelline membrane with the help of these pseudopodia and at the same time drag along the expanding sheet of ectodermal cells of that they are the leading members. Removal of the vitelline membrane inhibits epibolic movements and expansion of ectoderm.

Posted Date: 1/25/2013 5:58:18 AM | Location : United States







Related Discussions:- Epiboly of ectoderm, Assignment Help, Ask Question on Epiboly of ectoderm, Get Answer, Expert's Help, Epiboly of ectoderm Discussions

Write discussion on Epiboly of ectoderm
Your posts are moderated
Related Questions
Determine Requirement of Trace elements for Infant? Most elements, such as zinc and iodine, hold a major significance in infant nutrition. Zinc is associated with growth while

Q. What is the vestibular system? How does it operate? The vestibular system is the part of the ear that participates in the regulation and control of the equilibrium of the bo

Describe Basic steps in genetic engineering

How can Prevent the Symptoms Associated With Food Intolerance? Taking a few simple steps can help prevent the symptoms associated with food intolerance. These steps include:

What is ISQ In resonance frequency analysis implant stability quotient (ISQ) is use to quantify the frequency measurement of implants within a range between 3500 and 8500 HZ. I


Factors affecting vitamin utilization Raw soybean contains enzyme lipoxygenase which can be destroyed by heating for 5 min with steam at atmospheric pressure. Lipoxygenase cata

State the Uni-ocular Movements In each eye, for every movement there is an agonist, antagonist, and a synergist. An agonist is the main muscle that is active in carrying out t

Explain Nephrotoxicity Nephrotoxicity is the major dose-limiting toxicity of amphotericin B deoxycholate; sodium loading with  normal saline may prevent or ameliorate it and is

is the have 100 nuclus ?