The process occurring in the male gonad of sexually reproducing organism wherein the undifferentiated male germ cells develop into spermatocytes, which then transform into spermatozoa.


The spermatogenesis is the male counterpart of oogenesis in females. The spermatogenesis and oogenesis are the two forms of gametogenesis.

Spermatogenesis consists of stages: (1) spermatocytogenesis, (2) spermatidogenesis, and (3) spermiogenesis.

In humans, it starts at puberty and continues throughout lifetime. It occurs in the male testes and epididymis in a stepwise fashion. The entire process can take approximately 64 days.

Word origin: Greek, from sperma, spermat- (seed) + genesis »from Latin, from Greek, (birth, origin).
Related forms: spermatogenetic (adjective), spermatogenic (adjective)

Compare: oogenesis
See also: gametogenesis

Related terms:

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