Sperm are produced in the seminiferous tubules. Process of sperm production is called spermatogenesis. Energy provider for tail. Sperm counts dropping. Hormone production by testis.
Interstitial cells located between seminiferous tubules produce testosterone.
Pituitary LH stimulates the interstitial cells to make testosterone. Sperm are stored and mature here. Located on top of testis. Uncoiled epididymis is 20 feet long. Travel thru this structure takes 2-3 weeks.