The anterior fibers of the temporalis primarily perform which action?

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Multiple Choice

The anterior fibers of the temporalis primarily perform which action?

Explanation:
The main concept here is how the direction of muscle fibers determines its action. The anterior fibers of the temporalis are vertical and pull on the coronoid process to lift the mandible toward the maxilla. This makes them especially suited for elevating the jaw, which closes the mouth. That elevation is their primary role, whereas moving the jaw forward (protrusion) is mainly the job of the lateral pterygoid, and retracting the jaw is more associated with the posterior temporalis. Depression of the jaw isn’t a function of this muscle’s anterior fibers. So elevating the mandible is the best fit for what the anterior temporalis does.

The main concept here is how the direction of muscle fibers determines its action. The anterior fibers of the temporalis are vertical and pull on the coronoid process to lift the mandible toward the maxilla. This makes them especially suited for elevating the jaw, which closes the mouth.

That elevation is their primary role, whereas moving the jaw forward (protrusion) is mainly the job of the lateral pterygoid, and retracting the jaw is more associated with the posterior temporalis. Depression of the jaw isn’t a function of this muscle’s anterior fibers. So elevating the mandible is the best fit for what the anterior temporalis does.

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