cells), are produced in the paired testes (singular, testis)
that are suspended outside of the body in the scrotum(阴囊) . Although the testes develop in the abdominal cavity, they normally descend through the inguinal canal(腹股沟管) into the scrotum before birth or shortly thereafter. From puberty(青春 期) on, spermatozoa form continuously within the testes in coiled seminiferous tubules(精小管) . Their development requires the aid of special Sertoli cells and male sex hormones, or androgens(男性荷尔蒙), mainly testosterone(睾丸酮).
much-coiled tube on the surface of each testis, the epididymis(附睾). Here they remain until ejaculation(射精) propels them into a series of ducts that lead out of the body. The first of these is the vas deferens(输精管). This
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These hormones are manufactured in interstitial