What is Erectile Dysfunction?

Erectile dysfunction is the inability to achieve or maintain a hard, erect penis sufficient for sexual intercourse. Traditionally, this inability has been called "impotence." The term "erectile dysfunction" is more precise, because it refers only to erection problems. Men with erection problems often retain other sexual functions. For example, they may still have sexual desire and may still be able to have orgasms and ejaculate semen.

A natural erection is the result of a complex process. However, the control center is the brain. The brain, for example, is where sensations of sexual arousal are experienced. These sensations may involve psychological factors such as erotic fantasies or expectations that arouse sexual desire. Sensory factors, such as a scent, a tone of voice or the sight of a sexual partner undressing, are often involved.

The brain sends its arousal signals to the penile nerves. Penile nerves are also stimulated by direct sensory contact, such as by manual stroking of the genitalia and by the act of sexual intercourse itself. The nerve impulses go to two "erection chambers," the corpora cavernosa. There the nerve impulses cause relaxation of penile tissue and expanding of arterial blood vessels. The corpora cavernosa are two cylinders side-by-side in the penis. Covering them is a dense, elastic, fibrous envelope called the tunica albuginea.

As penile tissue relaxes and penile arteries expand, the blood flow into the erection chambers increases. The penis then swells in size. Veins that drain the blood flow are compressed against the inner wall of the tunica albuginea. The blood is thus trapped, making the penis hard and erect. Continued stimulation keeps the process going and maintains the erection.

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