The spermatogonia in the seminiferous tubules of testis are on four different stages, including primary spermatocytes, secondary spermatocytes, spermatoon, and spermatozoa.
生精小管内有处于不同发育时期的精原细
，初级精母细，次级精母细，精子细和精子；
,精子细The spermatogonia in the seminiferous tubules of testis are on four different stages, including primary spermatocytes, secondary spermatocytes, spermatoon, and spermatozoa.
生精小管内有处于不同发育时期的精原细，初级精母细，次级精母细，精子细和精子；
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