Deep Transverse Perineal Muscle

Origin: Internal surface of ischiopubic ramus and ischial tuberosity

Course and Distribution: Passes along superior aspect of posterior border of perineal membrane to perineal body and external anal sphincter

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

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