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The superficial pouch contains three thin muscles:

ischiocavernosus muscle, that covers the corpora cavernosa or crus of the penis
bulbospongiosus muscle, that covers the bulb of the penis
superficial transverse perineal muscle, that lies on the posterior edge of the urogenital diaphragm.

The bulbospongiosus muscle and ischiocavernosus muscles overly the root of the penis (Figure 42.4).