buccinator muscle

Medical Dictionary

buccinator muscle buc·ci·na·tor muscle (bŭk'sə-nā'tər)
A muscle with origin from the alveolar portion of the maxilla, mandible,and pterygomandibular ligament, with insertion into the orbicular muscle of the mouth, with nerve supply from the facial nerve, and whose action flattens the cheek and retracts the angle of the mouth. Also called cheek muscle.

The American Heritage® Stedman's Medical Dictionary
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