The reproductive organ in men is more visible than women. Men mostly concerned about sex and not on knowing about their organs. To make your sex organ function well, you should know the anatomy of the reproductive system.
The penis is made up of a long shaft and a sensitive head, called glans. The glans has an opening in it. This is the opening of the urethra, a narrow tube which performs two functions – one of carrying urine from the bladder and the other of carrying the semen from the vas deferens – the tube which leads from the testes. But it never performs both the functions at the same times. A small muscle closes off the entrance to the bladder during erection so that no urine and semen at the same time.
The shaft is covered with loose, wrinkly darkish skin which extends over tip to from the foreskin. The head is studded with a mass of nerve ending which make it the most sensitive part of the penis. The whole of the rim where the head joins the shaft is capable of providing some very pleasant sensations.
On the underside of the shaft is a delicate area the ferrum. Even the lightest touch to this part is enough to produce an erection. The sexual function of the penis is to penetrate the vagina and inject sperm. It is also the urinary outlet. Generally it remains flaccid but at the time of erection, it becomes erect and engorged with blood.
Erection increases the length and girth of the male organ. Normally the male organ hangs limply downward, but in its erect state it points horizontally outward or slightly upwards at an angle. A penis has no muscles and bones along its length, just a ring of muscles around the base which tightens during sexual excitement and helps to keep it erect.
The loose wrinkled skin which hangs down behind the penis and which contains the testes is called the scrotum. It has slightly coarse and hairy skin. The testes produce sperms and testosterone, the hormone responsible for the libido. The testes can only produce sperms at a temperature of 35 C, which is 2 C cooler than the temperature inside our body. Each testis contains tiny coiled tube. Sperms are made inside these tubes from puberty until well into old age.
When a man ejaculates, replacement sperms are made in these testes. When a man ejaculates, sperms are squeezed through these tubes and out. Almost 400 million sperms are carried in a teaspoonful of semen that comes out.