Superficial Transverse Perineal Muscle

Action: Stabilizes perineal body; provides structural support to adjacent pelvic and perineal structures.

Origin: Ischial tuberosity; ramus of ischium. 

Insertion: Perineal body.

Innervation: Perineal nerve (S2-S4). Arterial Supply: Perineal artery.

Due to the way that we preform the pelvis dissection, this muscle is only visible in corss section and is difficult to see.