seminiferous

1.The sperm originate in gonial cells (spermatogonia) in the walls of seminiferous tubules.

精子产生于精管壁性母细胞（精原细胞）。

2.The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia;

精原细胞期，精，明乳白色，生精管生殖细胞以精原细胞为主；

3.The testis at spermatid phase develops continually, and is deep in color, and the spermatogenetic cells in seminiferous tubule are primarily composed of spermatids.

精细胞期，精体积继续增大，颜色加深，生精管生殖细胞以精细胞为主；

4.The spermatogonia in the seminiferous tubules of testis are on four different stages, including primary spermatocytes, secondary spermatocytes, spermatoon, and spermatozoa.

生精管有处于不同发育时期精原细胞，初级精母细胞，次级精母细胞，精子细胞和精子；