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细胞，初级母细胞，次级母细胞，
细胞和；
母细胞
;
的;;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细胞，初级母细胞，次级母细胞，细胞和；
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