BIOM 3040 Study Guide - Final Guide: Neurulation, Motility, Notochord
30 Jan 2018
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Document Summary
Ingression cells break away and migrate as individuals (i. e. emt during gastrulation) Delamination layers of cells separate from one another as sheets of cells (formation of epiblast and hypoblast from the icm) Intercalation two cells layers interlace with each other. Epiboly cells flatten out cover more area. Invagination (evagination) tissue layer folds inwards or outwards. Involution cells move over a lip of tissue into the interior. Convergent extension cells form fewer layers and extend out. Delamination seperates the icm into the epiblast and the hypoblast. Hypoblast lies below and contributes to the yolk sac. As the embryo sinks into the endometrium: delamination occurs seperates icm into epiblast and hypoblast, cells of the hypoblast spread along the interior of the cytotrophoblast forms yolk sac. Part of epiblast is making the amniotic cavity. At the end of the second week have an embryo made up of 2 flat layers of cells.
