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Mentalis muscle: want to learn more about it?

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Mentalis muscle

Mentalis muscle (Musculus mentalis)
Mentalis is a paired conical facial muscle located in the chin. It belongs to the buccolabial muscles of facial expression, along with levator labii superioris alaeque nasi, levator labii superioris, levator anguli oris, zygomaticus major, zygomaticus minor, risorius, depressor labii inferioris, depressor anguli oris, orbicularis oris, incisivus superior and inferior, and buccinator muscles.

All these muscles work together to produce facial expressions that involve the lips, chin and cheeks. The mentalis muscle is involved in expressing doubt and contempt, as it elevates, everts and protrudes the lower lip, and wrinkles the skin of the chin.

Key facts about the mentalis muscle
Origin Incisive fossa of mandible
Insertion Skin of chin (Mentolabial sulcus)
Action Elevates, everts and protrudes lower lip, wrinkles skin of chin
Innervation Mandibular branch of facial nerve (CN VII)
Blood supply Inferior labial branch of facial artery, mental branch of the maxillary artery

This article will discuss the anatomy and function of mentalis muscle.

Origin and insertion

Mentalis muscle originates from the incisive fossa of mandible. Its short fibers descend inferiorly to insert to the skin of the chin, at the level of mentolabial sulcus.

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Relations

The mentalis muscles lie on the mandible, on each side of the frenulum of the lower lip. The superolateral part of each muscle is covered by the depressor labii inferioris muscle, while the remainder of the mentalis muscle bellies is subcutaneous.

Innervation

Mentalis is innervated by the mandibular branch of facial nerve (CN VII).

Blood supply

Inferior labial branch of facial artery and mental branch of the maxillary artery supply the mentalis muscle.

Function

Pullings its cutaneous attachment superiorly, mentalis muscle elevates the base of the lower lip, thus everting and protruding it. This movement also wrinkles the skin of the chin. The function of these movements is to adjust the shape of the lips for drinking, as well as to express facial expressions associated with the emotions of sorrow, contempt and doubt. 

Mentalis muscle: want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

What do you prefer to learn with?

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

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