The first step of human fertilization involves the penetration of the corona radiata. It is a set of cells that surround the egg cell, an indispensable barrier that not all sperm cells that reach the egg are able to cross.
By Dra. Laura de la Fuente Bitane (gynecologist), Zaira Salvador BSc, MSc (embryologist) and Romina Packan (invitra staff).
Last Update: 11/29/2018