The prostate is a walnut-sized gland located between the bladder and the penis; it secretes fluid that nourishes and protects sperm. The male urethra runs through the center of the prostate, from bladder to penis.
The bladder is a hollow, muscular organ in the lower abdomen that stores urine and allows urination to be infrequent and voluntary.
It is not uncommon for older men to develop benign prostatic hyperplasia (BPH), in which the prostate becomes enlarged, resulting in restriction of the ow of urine through the urethra. The prostate can also develop cancer, although that is much less common than BPH.