The sperm originate in gonial cells (spermatogonia) in the walls of seminiferous tubules.
子产生于输管壁的性母细
（
细）。
细
The sperm originate in gonial cells (spermatogonia) in the walls of seminiferous tubules.
子产生于输管壁的性母细（细）。
The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia;
细期，巢小，透明乳白色，生小管内的生殖细以细为主；
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细，初
母细，
母细，子细和子；
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