Only men have a prostate gland. From birth to puberty prostate remains small, about the size of a pea. During puberty it undergoes the first growth spurt, reaching the size of a walnut.
The prostate contains about 30 percent smooth muscle and about 70 percent glandular tissue composed of glands and small ducts. A thin membrane called the capsule covers the prostate.
Anatomically, it is located just under the urinary bladder, surrounding the base of the bladder and the beginning of the urethra. Urine made by the kidneys accumulates in the bladder and the urethra is the pipe that carries the urine outside. If you imagine a wine glass, the wide part would represent the bladder and the stem would be the urethra.
The prostate is located at the juncture, where the wide part ends and the stem begins. The prostate is shaped like a donut, with the urethra passing through the opening in the center of the gland. The part of the urethra that passes through the prostate is called the prostatic urethra.
The prostate is situated behind the pubic bone and in front of the rectum, which is why it is possible to feel the prostate during a digital rectal examination.