embryonic membrane

American  

noun

1. extraembryonic membrane.

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Etymology

Origin of embryonic membrane

First recorded in 1945–50

Example Sentences

He said the structures include all embryonic membranes as well as membranes outside the embryo.

From Washington Times

In some parasitic Hymenoptera there is only a single embryonic membrane formed by delamination from the blastoderm, while in a few insects, including the wingless spring-tails, the embryonic membranes are vestigial or entirely wanting.

From Project Gutenberg

Cenogenetic processes, on the other hand, include such phenomena as the formation of yolk and the embryonic membranes, the temporary allantoic circulation, the navel, the curved and contracted shape of the embryo, and the like.

From Project Gutenberg

Wheeler, however, compares with the “dorsal organ” the peculiar extra embryonic membrane or indusium which he has observed between serosa and amnion in the embryo of the grasshopper Xiphidium.

From Project Gutenberg