External sphincter muscle of male urethra
- External sphincter muscle of male urethra
Muscle infobox
Name = Sphincter urethrae membranaceae muscle
Latin = musculus sphincter urethrae externus urethrae masculinae, musculus sphincter urethrae membranaceae
GraySubject = 120
GrayPage = 429
Caption = The male urethra laid open on its anterior (upper) surface. (Region visible, but muscle not labeled.)
Caption2 = Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. (Region visible, but muscle not labeled.)
Origin = Junction of the inferior rami of the pubis and ischium to the extent of 1.25 to 2 cm.
Insertion = Ischiopubic rami
Action = Constricts urethra, maintain urinary continence
Blood =
Nerve = Branches from Dorsal nerve of the penis
MeshName =
MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 13540449
The external sphincter muscle of urethra (or sphincter urethrae membranaceae) surrounds the whole length of the membranous portion of the urethra, and is enclosed in the fasciæ of the urogenital diaphragm.
Its external fibers arise from the junction of the inferior rami of the pubis and ischium to the extent of 1.25 to 2 cm., and from the neighboring fasciæ.
They arch across the front of the urethra and bulbourethral glands, pass around the urethra, and behind it unite with the muscle of the opposite side, by means of a tendinous raphé.
Its innermost fibers form a continuous circular investment for the membranous urethra.
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External links
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* - "Muscles of the female urogenital diaphragm (deep perineal pouch) and structures located inferior to it."
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