A glycoprotein membrane surrounding the plasma membrane of an oocyte. It is a vital constitutive part of the latter, external but not extraneous to it. The zona pellucida first appears in multilaminar primary oocytes. [ http://en.wikipedia.org/wiki/Zona_pellucida ]

This is just here as a test because I lose it

Term information

database cross reference

pheno_slim, vertebrate_core

depicted by


has broad synonym

zona pellucida - vitelline membrane

has related synonym

zona radiata

vitelline envelope

vitelline membrane

pellucid zone

zona striata


striated membrane

homology notes

Outside the plasma membrane, three envelopes surround the ovum. The first, the primary egg envelope, lies between the plasma membrane and the surrounding cells of the ovary. The most consistent component of this primary layer is the vitelline membrane, a transparent jacket of fibrous protein. In mammals, the homologous structure is called the zona pellucida.[well established][VHOG]



Term relations