The spermatogonia in the seminiferous tubules of testis are on four different stages, including primary spermatocytes, secondary spermatocytes, spermatoon, and spermatozoa.
生
小管内有处于不同发育时期的原
，初级
，次级，子和子；
词质;质的;
的;;死;液;The spermatogonia in the seminiferous tubules of testis are on four different stages, including primary spermatocytes, secondary spermatocytes, spermatoon, and spermatozoa.
生小管内有处于不同发育时期的原，初级，次级，子和子；
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