Uberon definition : 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.;
Uberon related term : pellucid zone; zona radiata; zona striata; vitelline envelope; vitelline membrane; striated membrane; oolemma;
Uberon broad term : zona pellucida - vitelline membrane;
Uberon Homology note : 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];
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.