ANATOMY

Detailed explanation-1: -Risorius – the “smile” muscle. Pulls mouth corners laterally (outward) and forms dimples in the cheeks.

Detailed explanation-2: -The buccinator, along with orbicularis oris and pharyngeal constrictor, forms a functional unit (buccinator mechanism) which is essential for orofacial functions (swallowing, sucking, whistling, chewing, vowel pronunciation).

Detailed explanation-3: -The buccinator muscle has another interesting function, and that is expelling the air from the inflated vestibule while playing a wind instrument such as the trumpet. This is why the buccinator muscle is also called the “trumpet muscle".

Detailed explanation-4: -Action. Upon contractions, the buccinator pulls the angle of the mouth laterally and presses the cheeks to the teeth, thus decreasing the oral vestibule.