The pelvic floor can be separated into the superficial and the deep pelvic floors.
The superficial pelvic floor (synonym: the urogenital diaphragm) consists of the bulbospongiosus, ischiocavernosus, and the deep and superficial transverse perineal muscles.
The bulbospongiosus muscles (shown on the picture on page 2), the ischiocavernosus muscles and the deep and superficial transverse perineal muscles are all innervated by the deep branch of the perineal nerve from the pudendal nerve.
The bulbospongiosus muscles have been removed exposing the deep transverse perineal muscles. The ischiocavernosus and superficial transverse perineal muscles are depicted orange on the left side of the image and the deep transverse perineal muscle is orange on the right side of the image.
