Sphincter Urethrae
Pelvic Floor
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The muscle you voluntarily contract to stop urination mid-stream — strengthening it through Kegels is key for urinary continence.
Function
Compresses urethra to maintain continence
Origin
Ischiopubic rami and perineal membrane region
Insertion
Encircles membranous urethra
Innervation
Pudendal nerve (S2-S4)