Superficial Transverse Perineal
Pelvic Floor
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Helps stabilize the perineal body — the central anchor point where multiple pelvic floor muscles converge, like the keystone of a bridge.
Function
Fixes/stabilizes perineal body
Origin
Ischial tuberosity
Insertion
Perineal body
Innervation
Deep branch of pudendal nerve (S2-S4)