On reaching the oocyte, a human sperm cell must pass through what layer(s) before it can fuse with the plasma membrane of the egg?

Question

Quizplus · Accepted Answer

The sperm must first penetrate the corona radiata, which is the outermost layer of cells surrounding the oocyte. Then, it must pass through the zona pellucida, a glycoprotein layer surrounding the plasma membrane of the oocyte, before it can fuse with the egg's plasma membrane. The vitelline membrane is not a term used in human reproduction, and the cell wall and chorion are not relevant to this process.

On Reaching the Oocyte, a Human Sperm Cell Must Pass