Phimosis (paraphimosis): The foreskin cannot be retracted or if retracted cannot be returned to its normal position over the penis head.Hypospadias: A birth defect in which the opening for urine is on the front (or underside), rather than the tip of the penis.Serious problems can result from this painful condition. Priapism: An abnormal erection that does not go away after several hours even though stimulation has stopped.Atherosclerosis (damage to the arteries) is the most common cause of erectile dysfunction. Erectile dysfunction: A man's penis does not achieve sufficient hardness for satisfying intercourse.More blood flows in and less flows out of the penis, hardening the tissue in the corpus cavernosum. When a man becomes sexually aroused, nerves cause penis blood vessels to expand. The urethra runs through the corpus spongiosum, conducting urine out of the body.Īn erection results from changes in blood flow in the penis.Corpus spongiosum: A column of sponge-like tissue running along the front of the penis and ending at the glans penis it fills with blood during an erection, keeping the urethra - which runs through it - open.Blood fills this tissue to cause an erection. Corpus cavernosum: Two columns of tissue running along the sides of the penis.In circumcised men, the foreskin is surgically removed and the mucosa on the glans transforms into dry skin. Covering the glans is the foreskin (prepuce). Glans (head) of the penis: In uncircumcised men, the glans is covered with pink, moist tissue called mucosa.In addition to its sexual function, the penis acts as a conduit for urine to leave the body. The penis is the male sex organ, reaching its full size during puberty.
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