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
胞，初级母胞，次级母胞，子胞和子；
母
胞
词
心，子;胞质;胞质的;
的;;胞死;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胞，初级母胞，次级母胞，子胞和子；
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