Where does the process of spermatogenesis start?

• A. In the epididymis
• B. In the seminiferous tubules in between the Sertoli cells
• C. In the interstitial tissue of the testis
• D. In the vas deferens

Answer: (B)

Spermatogenesis starts in the seminiferous tubules of the testis, specifically in the germinal epithelium that sits between Sertoli cells. The spermatogonial stem cells in this niche divide and move toward the lumen as they differentiate through the stages of spermatogenesis, with Sertoli cells providing nourishment, support, and a protective environment along the way.

The epididymis is where sperm mature and are stored after production, not where the process begins. The interstitial tissue houses Leydig cells that produce testosterone to support sperm production, but the origin of spermatogenesis is not there. The vas deferens is part of the duct system that transports sperm after maturation.