Facial Nerve

Description

Arising from the stylomastoid foramen and coursing anteroinferiorly into the parotid region, the facial nerve (CN VII) is shown dividing into its terminal rami, temporal, zygomatic, buccal, marginal mandibular, and cervical, which radiate like spokes across the lateral face. Superior branches track toward the frontalis and orbicularis oculi, while the marginal mandibular ramus runs anteriorly along the inferior border of the mandible toward depressor anguli oris and mentalis. Deeper and more posterior, the chorda tympani is indicated as it leaves the facial canal, crosses the middle ear, and joins the lingual nerve to carry taste from the anterior two thirds of the tongue and parasympathetic fibers to the submandibular ganglion. Adjacent landmarks include the masseter laterally over the mandibular ramus and the sternocleidomastoid descending posteroinferiorly in the neck. A clean map of relationships. Facial nerve anatomy matters because small differences in branching and depth drive both surgical risk and clinical localization. Parotidectomy, facelift (rhytidectomy), and repair of mandibular fractures place the temporal and marginal mandibular branches at predictable danger zones, and iatrogenic weakness often presents as brow ptosis or asymmetry of the lower lip during smiling. The inclusion of the chorda tympani supports lesion pattern teaching: proximal facial nerve injury can combine ipsilateral facial paralysis with reduced lacrimation, hyperacusis from stapedius denervation, and taste disturbance. Bell palsy is the common reference point. Medical educators can drop this plate into head and neck anatomy modules, cranial nerve labs, or otology teaching when distinguishing intratemporal versus extratemporal facial nerve lesions. It also suits operative atlases and patient education graphics for parotid surgery planning where surgeons need the five primary radiating terminal rami in one glance. Anatomical accuracy verified by SciePro's Medical Advisory Board.