Presumptive Primordium

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Presumptive Primordium

 

in embryology, the cell material from which the primordium of a particular organ (neural plate, cord, epidermis) forms during embryonic development. The position of a presumptive primordium is determined by marking. Charts of presumptive primordia in the early gastrula stage have been made for various cordate animals. In some worms and mollusks the position of the presumptive primordium has been traced up to early cleavage.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.