The superficial transverse perineal muscles are narrow muscular strips that lie in the posterior part of the superficial pouch and run transversely across it.
Origin and Insertion:
The muscles arise from ischial tuberosity of respective side by tendinous fibers. After origin, the muscles run medially and are inserted into the perineal body. In the process, the bands join with those of the opposite side, with the sphincter ani externus muscle and with the bulbospongiosus muscle.
Superficial perineal muscles are supplied by the perineal nerve, which is a branch of the pudendal nerve.
The function of the superficial perineal muscles is to fix the perineal body in the center of the perineum.