Muscle of Perineum

Muscle: Superficial transverse perineal muscle

Origin: Internal surface of ischiopubic ramus and ischial tuberosity

Course and Distribution: Passes along inferior aspect of posterior border of perineal membrane to perineal body

Innervation: Muscular (deep) branch of perineal nerve, a branch of pudendal nerve (S₂-S₄)

Main Action(s): Supports and fixes perineal body/pelvic floor to support abdominopelvic viscera and resist increased intra-abdominal pressure