精原细胞初始是进行体细胞样的分裂,之后便进行减数分裂产生精细胞为初级精母细胞。继之发育成次级精母细胞。最近有人成功地将小鼠的次级精母细胞注入到成熟的卵子内,精子细胞内的半数染色体与卵细胞的核融合而受精。说明次级精母细胞已具备与卵细胞受精的能力,之后精细胞的各发育阶段为精细胞的受精提供运送能力。精子在 Spermatogonial cells initially undergo somatic cell division and subsequent meiosis to produce spermatids as primary spermatocytes. Subsequent development into secondary spermatocytes. Recently, it has been successfully injected into the mature sperm cells of the mouse secondary spermatocytes, and half of the chromosomes in the sperm cells are fused with the nuclei of the egg cells to be fertilized. This shows that the secondary spermatocytes have the ability to fertilize the oocytes, and then the spermatogenesis of the spermatocytes provides the ability to deliver spermatozoa for fertilization at each stage of development. Sperm in