Internal sphincter muscle of urethra
- Internal sphincter muscle of urethra
Infobox Muscle
Name = PAGENAME
Latin = musculus sphincter urethrae internus
GraySubject =
GrayPage =
Caption = Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. (Region visible, but muscle not labeled.)
Caption2 = Urinary bladder (Region visible, but muscle not labeled.)
Origin = Pubis ramus
Insertion = Median raphe | Blood =
Nerve = Pudendal nerve
Action =
Antagonist =
DorlandsPre = m_22
DorlandsSuf = 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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