Most amphibians exhibit teeth that have a slight attachment to the jaw or acrodont teeth. The teeth or baleen in the upper jaw sit exclusively on the maxilla. These morphological patterns carry over to teeth positioned on the pharyngeal jaw. There may also be enlargement of the forehead, jaw, and nose. Sebaceous glands are present on the angle of the jaw and mandible. Pitch is manipulated through a combination of movements of the lips, throat, tongue or jaw. Playing the violin entails holding the instrument between the jaw and the collar bone. Facial animation was done using blendshapes with bones for the jaw and the eyes. MacRae suffered from cancer of the mouth and jaw. Sweet diagnosed a dislocated jaw rather than infection. Rope wraps around their upper jaw, flippers and tail. Parotitis presents as swelling at the angle of the jaw. Those in the lower jaw were much smaller than those of the upper jaw. The predentary coincided with the premaxilla in the upper jaw. Clicking of the jaw joint may also develop.