The sperms are actually formed within the testicles which are suspended beneath the penis in the scrotum. The testicles serve two functions: firstly spermatogenesis, the production of sperms, and secondly the production of testosterone which is the important male hormone.
The testicles are oval in shape being about one and a half inches long and less than one inch in diameter. They have a very rich blood and nerve supply, and are extremely sensitive to pressure 01 injury. They are connected to the base of the bladder by a tube, the vas deferens, along which the sperms pass to the seminal vesicles at the base of the bladder where they are stored.
The production of sperms within the testicles is a carefully regulated process that commences fairly early in childhood and continues until old age. Men of 90 can produce perfectly good and viable sperms.