Sperm Development and Maturation: 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.

Fertilization (also known as conception, fecundation, syngamy and impregnation) is the fusion of gametes to initiate the development of a new individual organism. In animals, the process involves the fusion of an ovum with a sperm, which first creates a zygote and then leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilization, or outside (external fertilization). The cycle of fertilization and development of new individuals is called sexual reproduction.

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