abnormal facial muscle morphology abnormal buccinator muscle morphology 2017-09-18T11:59:36Z any structural anomaly of the thin quadrilateral muscle occupying the interval between the maxilla and the mandible at the side of the face that forms the anterior part of the cheek or the lateral wall of the oral cavity; it compresses the cheeks against the teeth and is used in acts such as blowing; it is an assistant muscle of mastication and in neonates it is used to suckle https://en.wikipedia.org/wiki/Buccinator_muscle MP:0030151 MPheno.ontology abnormal cheek morphology