The translucent membrane that encloses the hen's egg yolk and separates it from the albumen is known as the vitelline membrane.
The inner layer, which is formed in the ovary, and the vitelline membrane layer, which is produced in the oviduct, make up its two main layers. Zonal inhibitory proteins damage the oocyte's sperm receptors and trigger the release of any other attached sperm, which prevents more sperm from attaching. Then, the vitelline membrane cover the developing Zonal in an impenetrable barrier known as a fertilization membrane together with the hardened Zonal pellucida. The rigid, gel-like spherical "shell" known as the "zona pellucida" tightly encloses the mammalian egg cells. The vitelline membrane covering amphibian eggs is the comparable structure, and nearly every other kind of egg than mammals.
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