The testis at spermatocyte phase develops, and is translucent, and the spermatogenetic cells in seminiferous tubule are primarily composed of primary spermatocytes and secondary spermatocytes.

• 精母细胞期：精巢体积增大，半透明乳白色，主要由处于初级精母细胞和次级精母细胞阶段的生殖细胞组成；