It is composed of trapezius, latissimus dorsi, rhomboid major, rhomboid minor and levator scapulae. The levator scapulae is supplied by the dorsal scapular artery. The tensor veli palatini is found anterior-lateral to the levator veli palatini muscle. It supplies the superior rectus and levator palpebrae superioris. This can occur as a result of senescence, dehiscence or disinsertion of the levator aponeurosis. The levator palpebrae superioris elevates the upper eyelid. The voluntary, pubococcygeus muscle, part of the levator ani muscle partially constricts the vaginal opening. The pelvic diaphragm is composed of the levator ani and the coccygeus muscle. These exercises aim to increase the strength of the pelvic floor muscles (mainly levator ani). Palpation of the levator ani muscle may find tenderness. In combination with the levator ani, it forms the pelvic diaphragm. The iliococcygeus, the most posterior part of the levator ani, is often poorly developed. The levator labii superioris alaeque nasi muscle lifts the sides of the nostrils. The levator ani ascends from here. A levator raises a structure; a depressor moves a structure down.