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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.
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.
Lateral head anatomy detail
Lateral head anatomy detail. Neonatal dissection.
^Drake, Richard (2010). Gray's Anatomy of students. Philadelphia: Churchill Livingstone elseveier. pp. 855–866. ISBN978-0-443-06952-9.