Mentalis

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Mentalis
Mentalis.png
Muscles of the head, face, and neck.
Latin musculus mentalis
Gray's p.383
Origin anterior mandible
Insertion chin
Nerve mandibular branch of facial nerve
Actions elevates and wrinkles skin of chin, protrudes lower lip
Anatomical terms of muscle

The mentalis is a paired central muscle of the lower lip, situated at the tip of the chin.[1] It originates from the mentum and inserts into the chin soft tissue. The primary effect of the mentalis contraction is the upward-inward movement of the soft tissue complex of the chin, which raises the central portion of the lips in turn. In the setting of lip incompetence (the upper and lower lips do not touch each other at rest), the mentalis muscle contraction can bring temporary but strained oral competence.

In conjunction with orbicularis contraction, the mentalis muscle allows the lips to "pout." Externally, mentalis contraction causes wrinkling of the chin skin, as used in expressions of doubt or displeasure. It is sometimes referred to as the "pouting muscle."

Its fibers arise from the incisive fossa of the mandible, then course vertically downward to insert in the skin of the chin.

Geniospasm is a genetic movement disorder of the mentalis muscle.

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