Mental Nerve, Lateral View

Description

Shown in lateral profile, the mental nerve is traced as the terminal branch of the inferior alveolar nerve (V3) as it emerges from the mental foramen on the anterolateral mandible, typically inferior to the premolars and superior to the inferior border of the body of the mandible. From that exit point, the nerve fans anteriorly and superiorly into cutaneous branches for the chin and lower lip, running deep to the depressor anguli oris and depressor labii inferioris and in close relationship to the fibers of orbicularis oris at the labiomental crease. Portions of the mandibular body and adjacent facial musculature frame the neurovascular landmark. Clear topography. Mental nerve anatomy matters any time you work near the premolar region of the mandible. Local anesthetic for a mental nerve block is placed near the mental foramen to numb the lower lip and chin, and this view helps distinguish that sensory territory from facial nerve (CN VII) motor supply to the perioral muscles, a common point of confusion in teaching. It also supports risk reduction in dental implant placement, periapical surgery, and open reduction and internal fixation of mandibular fractures, where traction or transection can produce postoperative paresthesia or dysesthesia of the lower lip. Use this illustration in head and neck anatomy courses, dental anesthesia modules, and operative atlases covering mandibular approaches and mental foramen localization, or as a figure in patient education materials explaining numbness after dental procedures. Anatomical accuracy verified by SciePro's Medical Advisory Board.