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