Head and Neck Anatomy: Part II – Musculature
Buccinator 

The buccinator originates from a line starting along the alveolar process of the maxilla down the pterygomandibular raphe to the buccinator ridge of the mandible. This thin muscle inserts by merging in the complex of muscles surrounding the mouth as discussed under the orbicular oris. Its main function is to compress the cheeks, a skill that is seen when ones blows up balloons. Like the orbicularis oris it is very important in chewing to keep the food on the occlusal table as we chew.