1.The sperm originate in gonial cells (spermatogonia) in the walls of seminiferous tubules.
精子于输精管壁性母细胞(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,精巢小,透明乳,精小管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,精巢体积继续增大,颜加深,精小管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.