External sphincter muscle of male urethra
|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.)
|Origin||Junction of the inferior rami of the pubis and ischium to the extent of 1.25 to 2 cm.|
|Nerve||Deep branch of Perineal Nerve|
|Actions||Constricts urethra, maintain urinary continence|
|Latin||musculus sphincter urethrae externus urethrae masculinae, musculus sphincter urethrae membranaceae|
|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.
- 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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