College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What is the primary function of the depressor anguli oris muscle?

To elevate the corner of the mouth
To move the ear
To lower the corner of the mouth
To help in chewing

The correct answer is: To lower the corner of the mouth

The depressor anguli oris muscle primarily functions to lower the corner of the mouth. This action is crucial for expressing negative emotions, such as sadness or frowning. It exerts a downward pull on the corners of the mouth, contributing to various facial expressions. In understanding this muscle's role, it's important to recognize that other facial muscles have different functions. For instance, certain muscles are responsible for elevating the corners of the mouth to create smiles, while others might facilitate movements related to chewing or ear movement, but these are not the primary actions of the depressor anguli oris. Thus, the identification of this muscle's primary role as lowering the corner of the mouth highlights its significance in emotional expression and facial dynamics.