Where are sperm cells formed within the testes?

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Front view anatomical diagrams of the male and female reproductive systems, with labeled organs including penis, testis, prostate gland, uterus, ovary, and vagina. — human reproductive system Organs and structures of the male and female reproductive systems.

Sperm cells are formed within the testes inside numerous thin, tightly coiled structures known as seminiferous tubules.12

The process of sperm formation, called spermatogenesis, occurs within the lining of these tubules. It begins with primitive germ cells, known as spermatogonia, located in the outermost layer of the tubule lining. As these cells undergo development and maturation, they move toward the central lumen (cavity) of the tubule. Throughout this process, Sertoli cells interspersed within the tubule walls provide essential support and nourishment to the developing cells. Once the sperm have matured into spermatozoa, they are transported from the tubules to the epididymis for storage.132