External sphincter muscle of male urethra
||It has been suggested that this article be merged with External sphincter muscle of female urethra. (Discuss) Proposed since July 2014.|
|Sphincter urethrae membranaceae muscle|
The male urethra laid open on its anterior (upper) surface. (Region visible, but muscle not labeled.)
Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. (Region visible, but muscle not labeled.)
|Latin||musculus sphincter urethrae externus urethrae masculinae, musculus sphincter urethrae membranaceae|
|Junction of the inferior rami of the pubis and ischium to the extent of 1.25 to 2 cm.|
|Deep branch of Perineal Nerve|
|Actions||Constricts urethra, maintain urinary continence|
|Anatomical terms of muscle|
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 innermost fibers form a continuous circular investment for the membranous urethra.
- Origin, insertion and nerve supply of the muscle at Loyola University Chicago Stritch School of Medicine
- urethral+sphincter at eMedicine Dictionary
- Anatomy figure: 41:06-04 at Human Anatomy Online, SUNY Downstate Medical Center - "Muscles of the female urogenital diaphragm (deep perineal pouch) and structures located inferior to it."
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