Reproductive Endocrinology Glossary
100 terms total — 4 showing — Last updated 15 Sep 2026
blastocyst
Advanced embryo stage with fluid-filled cavity, typically developing 5-6 days after fertilization.
zona drilling
Laboratory technique creating an opening in the zona pellucida to assist embryo hatching and implantation.
zona hatching
The process by which a blastocyst breaks free from the zona pellucida to enable implantation.
zona pellucida
Glycoprotein shell surrounding mammalian eggs that sperm must penetrate for fertilization.
zona-free hamster egg penetration test
Laboratory assay using hamster eggs to evaluate human sperm's ability to penetrate and fertilize.