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Mentalis Muscle
Muscular System

Mentalis Muscle

Musculus mentalis

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Quick Facts

Origin: Incisive fossa of mandible.

Insertion: Subcutaneous tissue of chin.

Action: Elevates and protrudes the lower lip.

Innervation: Marginal mandibular branch of facial nerve (CN VII).

Arterial Supply: Inferior labial artery and mental branch of inferior alveolar artery.

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The mentalis muscle originates from the incisive fossa of the mandible.


The mentalis muscle inserts into the skin of the chin.


The mentalis muscle elevates and protrudes the lower lip. This action is used during drinking and when expressing some facial expressions (Standring, 2016).

List of Clinical Correlates

- Bell’s palsy


Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

Learn more about this topic from other Elsevier products


ScienceDirect image

192 Geniospasm is an inherited paroxysmal tremulous movement of the mentalis muscle that begins in childhood and may be induced by emotional stress.

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