External sphincter muscle of male urethra
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| Sphincter urethrae membranaceae muscle | ||
|---|---|---|
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| The male urethra laid open on its anterior (upper) surface. (Region visible, but muscle not labeled.) | ||
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| 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 | |
| Gray's | subject #120 429 | |
| Origin: | junction of the inferior rami of the pubis and ischium to the extent of 1.25 to 2 cm., and from the neighboring fasciæ | |
| Insertion: | its fellow of the opposite side | |
| Artery: | ||
| Nerve: | perineal branch of the pudendal nerve (S2,3,4) | |
| Action: | Constricts urethra, maintain urinary continence | |
| Dorlands/Elsevier | m_22/13540449 | |
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.
Additional images
 Right hip bone. Internal surface. |
External links
- LUC sphu
- sphincter+urethrae at eMedicine Dictionary
- SUNY Figs 41:06-04 - "Muscles of the female urogenital diaphragm (deep perineal pouch) and structures located inferior to it."
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
Anatomy: urinary system | |
|---|---|
| Abdomen | Kidneys • Ureters • Orifice of ureter |
| Pelvis | Urinary bladder (Uvula, Trigone, Detrusor, Apex, Neck)
Urethral sphincters (External sphincter muscle of male urethra, External sphincter muscle of female urethra, Internal sphincter muscle of urethra) Urethra |
| Development | Development of the urinary and reproductive organs |
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