outer chorion

Abbreviation:

OC

Definition:

The outermost of usually two layers of chorion secreted by the follicular epithelium; always sculptured and usually formed into a corolla and/or micropylar collar around the micropyle at the anterior end of an egg.

Synonyms:

capsule, chorion, endochorion, enveloping layer, enveloping membrane, exochorion, external membrane, gelatinous covering, investing capsule, membrane, membrane exochoriale, membranous covering, membranous sheath, outer chorionic pellicle, outer layer, outer wall, pellicle, reticular membrane
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