De*lam`i*na"tion(?), n. (Biol.) Formation and separation of lamin or layers; one of the methods by which the various blastodermic layers of the ovum are differentiated.
This process consists of a concentric splitting of the cells of the blastosphere into an outer layer (epiblast) and an inner layer (hypoblast). By the perforation of the resultant two-walled vesicle, a gastrula results similar to that formed by the process of invagination.
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Wed 19th December 2018