The urethra (pl.: urethras or urethrae) is the tube that connects the mammalian urinary bladder to the urinary meatus.[1][2] In placental mammals, the urethra transports urine through the penis or vulva during urination and semen through the penis during ejaculation.[3]
The external urethral sphincter is a striated muscle that allows voluntary control over urination.[4] The internal sphincter, formed by the involuntary smooth muscles lining the bladder neck and urethra, receives its nerve supply by the sympathetic division of the autonomic nervous system.[5] The internal sphincter is present both in males and females.[6][7][8]
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