Buccinator originates in the maxilla and mandible in the area of the molar teeth and inserts into various muscles at the corner of the mouth. It acts to compress the cheeks tight to the teeth, and tighten and pull the lip corners inwards and somewhat laterally, often dimpling the cheeks. It forms a large part of the lateral wall of the mouth. Its functions include keeping food in the mouth where it can be masticated by the teeth. Because of its importance in expelling air through pursed lips, blowpipes, or wind instruments, it has been called the "trumpet muscle."

Buccinator is innervated by the deep buccal branches of the facial nerve (VII) and is supplied with blood by the maxillary and facial arteries.

Action of Buccinator

 

A Human Face