Neha Patil (Editor)

External sphincter muscle of male urethra

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Covid-19
Insertion  Ischiopubic rami
Dorlands /Elsevier  m_22/13540449
External sphincter muscle of male urethra
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

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 fasciƦ 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 fasciae.

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 raphe.

Its innermost fibers form a continuous circular investment for the membranous urethra.

References

External sphincter muscle of male urethra Wikipedia


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