Prostate

The prostate gland, which is about the size of a walnut, lays under the bladder and surrounds the uretha. The seminal vehicles above the prostate work with the prostate to produce fluid that nourishes the sperm. This is the fluid that produces most of the volume of semen that is ejaculated during sexual intercourse.

Before sexual intercourse the penis becomes erect which enables penetration during intercourse. The erection is caused by a large increase in blood supply to the penis. Muscles tighten up around the veins that normally drain the blood from the penis and this contraction slows down the outflow of blood from the penis. Ejaculation occurs at the climax of the sexual act. Nerves cause muscle contractions along the ducts of the epididymis, prostate and seminal vehicles to force semen into the urethra. The neck of the bladder tightens up to keep the semen from coming back into the bladder. After the ejaculation the muscles relax and the blood exits from the penis which returns to normal.

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