生理学 有关睾丸 雄激素（Physiology relating to testicular androgen）.docVIP

生理学 有关睾丸 雄激素（Physiology relating to testicular androgen） The organism growth and development to a certain stage, and can produce similar to their own offspring, this function is called reproductive (reproduction), any biological individual life is limited, is bound to aging and death. All living creatures perpetuate their lineage by producing new individuals, so reproduction is an important life activity for animals to stretch and reproduce. In animal reproduction is higher, the male reproductive organs through the activities to achieve the reproductive processes including germ cells (sperm and eggs) formation process, an important part of mating and fertilization and embryo development. About testis The male main reproductive organ is the testis, moreover has the epididymis, the vas deferens, the seminal vesicle, the prostate gland, the urethra ball gland, the penis and so on to have the attribute organ. First, testicular function (I) spermatogenesis of testis; The testis consists of seminiferous tubules and mesenchymal cells. The epithelium of seminiferous tubules is composed of spermatogenic cells and supporting cells. The original of the spermatogenic cells of spermatogonial cells, kidney affixed to the seminiferous tubular membrane, from the beginning of puberty, spermatogonia stage the formation of sperm, sperm production process: spermatogonium, primary spermatocyte, secondary spermatocyte, spermatid and sperm. In the seminiferous tube wall in different developmental stages of spermatogenic cells are orderly arranged from the basement membrane to the lumen, were spermatogonia, primary spermatocyte, secondary spermatocyte, sperm cell, differentiation of sperm, sperm cells into the support until maturity from the tube cavity, from spermatogonial cell development about two and a half months to become sperm. Sertoli cells provide nutrients for all levels of reproductive cells and maintain and support them. It provides a suitable microenvironment for the different