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Internal sphincter muscle of urethra - Wikipedia, the free encyclopedia

Internal sphincter muscle of urethra

From Wikipedia, the free encyclopedia

Internal sphincter muscle of urethra
Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. (Region visible, but muscle not labeled.)
Urinary bladder (Region visible, but muscle not labeled.)
Latin musculus sphincter urethrae internus
Origin Pubis ramus
Insertion    Median raphe
Artery:
Nerve: Pudendal nerve
Action:
Dorlands
/Elsevier
m_22/13540450

The internal sphincter muscle of urethra is a muscle which constricts the internal urethral orifice. It is the junction of the urethra with the urinary bladder. The muscle is made of smooth muscle, so therefore it is under involuntary control. This is the primary muscle for constricting the release of urine.


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