Urethra

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The urethra is the drainage duct of the bladder, with its internal opening at the inferior angle of the trigone of the bladder. In the male, the urethra enters the prostate gland as the prostatic urethra, then passes through the pelvic diaphragm and the urogenital diaphragm of the perineum as the membranous urethra, to enter the penis as the spongy (penile) urethra. In the female, the urethra passes through the pelvic and urogenital diaphragms, anterior to the vagina, as an independent structure.