Several other muscles function in moving the lips and the skin surrounding the mouth. The orbicularis oris, which encircles the mouth, and the buccinator are sometimes called the kissing muscles because they pucker the mouth. The buccinators also flattens the cheeks as in whistling or blowing a trumpet and is therefore sometimes called the trumpeter’s muscle. Smiling is accomplished primarily by the zygomaticus muscles, which elevate the upper lip and corner of the mouth. Sneering is accomplished by the levator labii superioris because the muscle elevates one side of the upper lip, and frowning or pouting largely by the depressor anguli oris, which depresses the corner of the mouth.