Corpus: Mentalis muscle
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from Latin: mentum - chin
Synonym: chin muscle
1. Definition
The mentalis muscle is a superficial muscle in the area of the mouth that tightens the chin skin. It is part of the mimic musculature.
2. Course
The mentalis muscle has its origin on the mandible in the incisive fossa, on the alveolar wall of the second mandibular incisor (incisivus). The fibres extend caudally into the chin skin, where they find their insertion.
3. Innervation
The mentalis muscle is innervated by the ramus marginalis mandibularis of the VII cranial nerve (facial nerve).
4. Function
The mentalis muscle pulls the chin skin upwards and pushes the lower lip forwards in co-operation with other facial muscles. It thereby produces the expression of pouting or "being offended". It is fused with the corium, which causes the skin to follow the muscle movements.