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
，初级精
，次级精，精子和精子；
词质;质的;
的;;死;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，初级精，次级精，精子和精子；
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