The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia;
原细胞期，巢小，透明乳白色，生小管内的生殖细胞以原细胞为
；
子发生的The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia;
原细胞期，巢小，透明乳白色，生小管内的生殖细胞以原细胞为；
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，生小管内的生殖细胞以细胞为；
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