Testicles

     The human testicles are located in grants, behind and at the bottom of the penis, and include a thick wall, the albuginée of the testicle (tunica albuinea testis), which envelops extremely slim and wrapped around tubules, are tubes séminifères (tubuli seminiferi recti). These tubes are wallpapered with a coat of nourishing cells (Cell of Sertoli).

     Spermatozoons are produced between the puberty and old age from germinal strain cells (Spermatogonie) which are subjected to the meiosis. These tubes result in the epididymis (epididymis), where the new spermatozoons maturent, and then in the vas deferens (go deferens) which results in urethra. During sexual stimulation, spermatozoons cross testicles to the channel éjaculateur (ductus ejaculatorius) by urethra; the prostate, by muscular shrinkages, makes ejaculate spermatozoons, by dispelling them in a medium fluid (the semen)by the penis.

     Semen is therefore composed of spermatozoons and seminal liquid. En case of vasectomy or sterility other one (knowledge par example) although the identical sensation soit, liquidates alone it seminal has produced. For sky assure of its viability, in another way. In the normal éjaculation semen is cast (with hindsight up to 50 cm.) and by jerks (correspondents in muscular shrinkages of the prostate).

     Between tubes séminifères interstitielles cells of the testicle or cells of Leydig are, which produce different stéroïdes hormones (testosterone in most cases and other androgènes) and peptidique (Insl3: Insulin-like 3, implicated in testicular descent in the scrotum)).