The sperm originate in gonial cells (spermatogonia) in the walls of seminiferous tubules.
产
于输管壁
性母细胞（原细胞）。
,产
液,输送;宫;;房;;，胆囊;;，肾;
皮;;
管；细管The sperm originate in gonial cells (spermatogonia) in the walls of seminiferous tubules.
产于输管壁性母细胞（原细胞）。
The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia;
原细胞期，巢，透明乳白色，管
殖细胞以原细胞为主；
The testis at spermatid phase develops continually, and is deep in color, and the spermatogenetic cells in seminiferous tubule are primarily composed of spermatids.
细胞期，巢体积继续增大，颜色加深，管殖细胞以细胞为主；
The spermatogonia in the seminiferous tubules of testis are on four different stages, including primary spermatocytes, secondary spermatocytes, spermatoon, and spermatozoa.
管有处于不同发育时期原细胞，初级母细胞，次级母细胞，细胞和；
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