Urethra
The urethra (pl.: urethras or urethrae) is the tube that carries urine from the urinary bladder to the outside of the body through the penis or vulva in placental mammals. In males, it carries semen through the penis during ejaculation.
The external urethral sphincter is a striated muscle that allows voluntary control over urination. The internal sphincter, formed by the involuntary smooth muscles lining the bladder neck and urethra, is innervated by the sympathetic division of the autonomic nervous system and is found both in males and females.
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