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Urinary Tract Male

In the human male, the urethra is about 8 inches (20 cm) long and opens at the end of the penis. The urethra provides an exit for urine as well as semen during ejaculation. The urethra is divided into four parts in men, named after the location:
1. Pre-prostatic urethra: This is the intramural part of the urethra and varies between 0.5 and 1.5 cm in length depending on the fullness of the bladder.
2. Prostatic urethra: Crosses through the prostate gland. There are several openings: (1) the ejaculatory duct, (2) several prostatic ducts, (3) the prostatic utricle.
3. Membranous urethra: A small (1 or 2 cm) portion passing through the external urethral sphincter. This is the narrowest part of the urethra. It is located in the deep perineal pouch. The bulbourethral glands (Cowper's gland) are found posterior to this region but open in the spongy urethra.

Deficient leydig cells

A Leydig cell tumor is a tumor of the testicle. It develops from Leydig cells -- the cells in the testicles that release the male hormone, testosterone. The cause of this tumor is unknown. There are no known risk factors for getting this tumor. Unlike germ cell tumors of the testicles, this tumor does not seem to be linked to undescended testes (cryptorchidism).

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