Collage visualization depicting the development and maturation of sperm. The development of sperm occurs in two phases, spermatogenesis and spermiogenesis. Spermatogenesis , the production of male gametes, and spermiogenesis, the subsequent development of the male gamete into motile spermatozoon, both occur in the seminiferous tubules located in the testes. As the precursor sperm cells mature, they migrate toward the lumen of the tubule. The spermatids then swim through the lumen to the epididymis where they continue to mature.
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