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External urethral sphincter (female)
Other Terms:
Sphincter urethrae - female
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.
Insertion
Anterior wall of the vagina.
Action
Close the urethra.
Nerve supply
Perineal branches of the pudendal nerve (S2, S3, and S4)
Blood supply
Internal pudendal artery from the internal iliac artery.
