embryonic membrane


Also found in: Dictionary, Thesaurus, Encyclopedia.

fe·tal mem·brane

a structure or tissue that develops from the zygote but does not form part of the embryo proper.

embryonic membrane

fe·tal mem·brane

(fē'tăl mem'brān)
A structure (e.g., chorion) or tissue that develops from the zygote but does not form part of the embryo proper.
Synonym(s): embryonic membrane.

embryonic membrane

or

extraembryonic membrane

any of the protective membranes surrounding the developing embryo in animals, that are involved in the respiration and nutrition of the developing organism. They derive from the zygote, lie outside the embryo proper, and form the CHORION, ALLANTOIS, AMNION and YOLK SAC.
References in periodicals archive ?
Each larva is surrounded only by an embryonic membrane, which eventually breaks, releasing the veliger larva.
Stage 5: late embryonic maturation; second embryonic membrane has ruptured, freeing the second antennae; shell spine remains curved along the anterior carapace edge
Embryonic viability was estimated by the macroscopical characteristics of the embryonic membranes, degree of vascularization of the allantochorion and embryo development, according to that described by Boshier y Guillomot [3, 8].