Marginal mandibular branch of the facial nerve

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Nerve: Marginal mandibular branch of the facial nerve
Gray788.png
Plan of the facial and intermediate nerves and their communication with other nerves. (Labeled at center bottom, second from bottom, as "Mandibular".)
Ramusmarginalismandibularisnervifacialis.png
The nerves of the scalp, face, and side of neck.
Latin ramus marginalis mandibularis nervi facialis
Gray's p.905
From facial nerve

The marginal mandibular branch of the facial nerve passes forward beneath the platysma and depressor anguli oris, supplying the muscles of the lower lip and chin, and communicating with the mental branch of the inferior alveolar nerve.

Muscles innervated

The marginal mandibular branch innervates the following muscles:1

  • Depressor labii inferioris - lowers bottom lip down and laterally. Origin: Anterior part of oblique line of mandible. Insertion: Lower lip at midline, blends with muscle from opposite side.
  • Depressor anguli oris (triangularis) - lowers the corner of the mouth down and laterally. Origin: Oblique line of mandible below canine, premolar, and first molar teeth. Insertion: Skin at the corner of mouth and blending with orbicularis oris.
  • Mentalis - raises and protrudes lower lip as it wrinkles skin on chin. Origin: Mandible inferior to incisor teeth. Insertion: Skin of chin.

Clinical significance

The marginal mandibular nerve may be injured during surgery in the neck region, especially during excision of the submandibular salivary gland or during neck dissections.

Additional images

References

  1. ^ Drake, Richard (2010). Gray's Anatomy of students. Philadelphia: Churchill Livingstone elseveier. pp. 855–866. ISBN 978-0-443-06952-9. 

External links

This article incorporates text from a public domain edition of Gray's Anatomy.









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