<embryology, ornithology> One of the set of extra embryonic membranes, growing out from the gut over the yolk surface, in birds formed from the splanchnopleure, an outer layer of splanchnic mesoderm and an inner layer of endoderm.

(11 Mar 2008)

yolk cell, yolk cells, yolk cleavage, yolk membrane < Prev | Next > yolk sac carcinoma, yolk sac tumour, yolk stalk

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