A Lateral Perspective of the Mandibular Branch of the Facial Nerve in a Male

Description

Shown from a lateral perspective of the male head and upper neck, the facial nerve (cranial nerve VII) emerges near the stylomastoid foramen and courses within the parotid region before giving rise to the marginal mandibular (mandibular) branch along the inferior border of the mandible. The nerve runs superficial to the masseter and crosses toward the lower lip, traveling anterior to the angle of the mandible as it approaches the depressor anguli oris and depressor labii inferioris at the corner of the mouth. Adjacent landmarks commonly visible in this projection include the temporalis and masseter muscles superiorly and laterally, and the sternocleidomastoid descending posteroinferiorly. For head and neck surgery, this branch is the one that keeps you honest. Its position relative to the mandibular border is the key teaching point because it can dip inferior to the mandible, where it becomes vulnerable during submandibular gland excision, neck dissection levels I and II, rhytidectomy (facelift), and incision or drain placement for mandibular angle infections. Injury produces lower lip asymmetry with an inability to depress the ipsilateral oral commissure, a deficit that patients notice immediately and clinicians often document as marginal mandibular palsy rather than a global facial nerve lesion. Use this artwork for anatomy and dental curricula covering facial expression, for operative atlases describing parotid and submandibular approaches, and for patient-facing consent materials explaining risks of facelift or salivary gland surgery in the perimandibular region. It also supports radiology-pathology correlation when discussing periparotid masses that displace the facial nerve branches. Anatomical accuracy verified by SciePro's Medical Advisory Board.