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External urethral sphincter - male

Other Terms: Sphincter urethrae - male

Muscle parts

None

Latin name

Musculus sphincter urethrae externus (female)

Latin muscle parts

None

Group

Pelvis/perineal wall – lateral musculature – middle layer

Etymology

In English, this muscle’s name is the outer muscle that binds tight around the urine maker. The word external comes from the Latin externus meaning “outward.” The word urethrae arises from the Greek ourethra meaning “to make urine.” This comes from the Greek ouron meaning “urine.” This is an ancient term that is traceable back to the time of Hippocrates. The word sphincter comes from the Greek sphinkter meaning “that which binds tight,” which in turn comes from the Greek verb sphingein meaning “to bind tight.”

Origin

Inside surface of the inferior pubic ramus and the anterior surface of the prostate gland.

Insertion

Posterior surface of the prostate gland and the perineal body.

Action

Close the urethra; assists with ejaculation.

Nerve supply

Perineal branches of the pudendal nerve (S2, S3, and S4)

Blood supply

Internal pudendal artery from the internal iliac artery.

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