A Reproductive Lexicon


Ownership of this website has been transferred from Northwestern University to Michigan State University.
Please note that some site information may be inaccurate while adjustments to reflect this organizational change are made.

MOOC Advertisement

Learn More:
Get An Introduction to Reproduction

Learn more about the science of reproduction. Dr. Teresa Woodruff, creator of Repropedia, is offering a free online course exploring the world of reproduction.

Get Started!

germinal vesicle

The germinal vesicle is the nucleus of an oocyte that is arrested in prophase of meiosis I. The nuclear envelope of the germinal vesicle will break down in a process known as germinal vesicle break down (GVBD) when the oocyte resumes meiosis in response to the luteinizing hormone (LH) surge that occurs prior to ovulation.

Also Known As: