A testicle, also called testis (pl. Testes) is the male gonad in all gonochoric animals, including humans, and is homologous to the ovary, which is the female gonad. Testicles, or testes, are the part of the male reproductive system that makes sperm and hormones.

Talk to your healthcare provider if your testicles change in some … The testis, or testicle, contains the long, coiled seminiferous tubules in which the spermatozoa are formed. Between the tubules are cells that secrete testosterone and other masculinizing steroid …