Testis seminiferous epithelium, spermatogenesis is the place. Testis contains a lot of seminiferous tubules, each testicle is estimated that about 400 to 600 seminiferous tubules, the total length of over 250 meters, forming a "huge" sperm to create "factory", the testes produce billions every day possible sperm.
Animate located the seminiferous tubules in seminiferous epithelium cells and supporting cells of two sperm cells, support cells between the "close connection" combine to form a barrier, so that the lumen of the seminiferous can not communicate with the outside world. Spermatogenesis by spermatogonia after 6 postmitotic developed into 64 primary spermatocytes. Primary spermatocytes after the first meiotic division into two primary spermatocytes, secondary spermatocytes after second meiotic division to become four sperm cells. At this time the sperm cells contain only half of the 23 pairs of chromosomes, ie 23 chromosomes, the sex chromosomes, the sperm cell contains only X or Y chromosome. Thus 64 primary spermatocytes became 256 sperm cells. Spermatogonia and spermatocytes is circular, no tail, develop into sperm cells after the gradual emergence of the tail. After 19 stages of sperm cell processing, modification, and finally develop into tadpole-shaped sperm.
Sperm from the top of Sertoli cells fall off into the lumen of the seminiferous tubules, then during the development of sperm in the testis is completed, a process that takes about 64 days time. After completing the process in the development of testicular sperm from the testicles into the epididymis, where to stay two to three weeks, in order to develop into mature sperm motility and sperm insemination have the ability, so a spermatogonia develop into mature sperm need 90 days or so, which is why the use of a drug treatment less asthenozoospermia must be sustained three months of reasons.
