Reproductive System - Male


The male reproductive system consists of the testes, penis, ducts that connect them, and accessory glands or prostate gland. The two testes are oval shaped organs that hang between the legs in the scrotum. The testes produce sperms which are capable of swimming in order to look for the egg they have to fertilize.


Male Reproductive System The testes since are present in the scrotum have a temperature lower than the body's by about 5 degree F or 3degree C. this is optimal for sperm production. Daily several million sperms are produced puberty onwards. The production and maturation of each sperm takes about 2 months. Each second millions of sperms are made in the seminiferous tubules, from where they pass to the epididymis to mature. The production is controlled by- luteinizing and follicle stimulating hormones (LH and FSH). The penis is a tube shaped organ that facilitates the tranfer of sperm into the female vagina during intercourse.. the penis has three layers of spongy tissue that enables it to become erect. The urethra present in the penis carries both the urine and semen to the outside.

     Vas deferens carries the mature sperm from the epididymis to the urethra, which it joins just below the bladder. Emptying into each vas deferens, just behind the bladder, is a seminal vesicle. Seminal vesicle and prostate gland, which surrounds the urethra where it leaves the bladder, produce secretions that mix to form semen. Semen acts as a fuel provider and as a carrier for the sperms.

Erection process:  The penis needs to become erect so that it can be inserted in the vagina. Erection makes the penis stiff and increases its length considerably. The erection is a reflex action controlled by the Autonomic Nervous System. During sexual arousal, arterioles supplying the penis get wider, resulting in increased blood flow. This fills the spaces in the spongy cylinders inside the shaft and the glans penis, making the penis expand and become stiff.

Ejaculation process:
 Ejaculation is also a reflex action controlled by the Autonomic Nervous System. It is triggered when the sexual act reaches a critical level of excitement. It has two phases- in the first, the vas deferens contract to squeeze the sperm towards the base of the penis, and the prostate gland seminal vesicles release their secretions to make semen. At this stage the ejaculation is unstoppable. In the second, muscles at the base of penis cotract every 0.8 seconds and force the semen out of the penis in upto 5 spurts. Almost 5 ml of semen is released.

Did you know?-----
There are about 300 million sperms in each ejaculate i.e. about 5 ml of semen and only one sperm is enough to fertilize the egg.