**Question:** All are elevators of mandible except

A. Levator anguli oris
B. Levator labii superioris
C. Levator labii inferioris
D. Mentalis muscle

**Correct Answer:** .

**Core Concept:** The mandible, also known as the lower jaw, is a moveable bone in the skull that forms the lower part of the mouth's dental arch. The muscles of mastication are responsible for moving the mandible. In this question, we are discussing the elevators of the mandible - muscles that help to raise the jaw.

**Why the Correct Answer is Right:** The correct answer, "Mentalis muscle", is not an elevator of the mandible because it is primarily responsible for depressing (lowering) the lower lip and the angle of the mouth. The other options are correct:

**Option A: Levator anguli oris** is responsible for lifting the corner of the mouth, contributing to smiling and elevating the mandible.

**Option B: Levator labii superioris** is an elevator of the mandible, as it helps to lift the upper lip and raises the mandible.

**Option C: Levator labii inferioris** is another elevator of the mandible, as it helps to lift the lower lip and elevates the mandible.

**Option D: Mentalis muscle** is incorrect because it depresses the lower lip and the angle of the mouth, not elevating the mandible.

**Why Each Wrong Option is Incorrect:**

- **Option A: Levator anguli oris** is incorrect because it primarily lifts the corner of the mouth and is not responsible for raising the mandible.

- **Option B: Levator labii superioris** is incorrect because it primarily lifts the upper lip, not the mandible, which is the main function of an elevator of the mandible.

- **Option C: Levator labii inferioris** is incorrect because it primarily lifts the lower lip, not the mandible, which is the main function of an elevator of the mandible.

**Clinical Pearl:** Understanding the roles of muscles in the facial region is crucial for understanding facial expressions and movement. In clinical practice, recognizing the functions of these muscles will help in diagnosing and treating patients with dysfunctional facial movements or deformities.