SCIENCE
Male Reproductive System
These oval-shaped glands are protected by a sac called the scrotum. After the sperm cells are produced, they are stored in a large coiled tube on the outer surface of the testicle called the epididymis. From this tube, the sperm go into a larger tube called the seminal vesicle, which eventually carries them to the external reproductive organ, the penis. Along the way sperm is nourished by a sugary fluid from the prostate gland which is the most common site for cancer in men, and fluid from the Cowper's gland which are two small glands located near the bladder. These fluids plus the sperm cells combine to form semen, the fluid ejaculated from the penis during orgasm. Before a male ejaculate, the spongy tissue surrounding the penis becomes engorged with blood causing the penis to become stiff and hard. This is known as an erection. The tube that carries the semen from the body is the urethra. This tube also carries urine from the bladder. Males can also have uncontrolled ejaculation during sleep, which are called nocturnal emissions.
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