Cervical Branch of the Facial Nerve

Description

Arising from the parotid plexus after the facial nerve exits the stylomastoid foramen, the cervical branch descends inferiorly and anteriorly along the upper neck toward the submandibular region. Its fine fibers course superficial to the carotid sheath and deep to the platysma, traveling inferior to the marginal mandibular branch that tracks along the inferior border of the mandible. Adjacent landmarks commonly included in this field are the posterior belly of the digastric and stylohyoid superiorly, the sternocleidomastoid laterally, and the superficial facial and submental vessels crossing the submandibular triangle. This slender, remote motor branch matters because it is exposed in low submandibular incisions and upper neck dissection, where traction or transection can denervate the platysma and contribute to lower lip asymmetry that can be mistaken for marginal mandibular palsy. Surgeons often use the mandibular angle, facial vein, and the investing fascia over the submandibular gland as practical cues, but the cervical branch can run unexpectedly low and anterior, especially when the platysma is thin. Small nerve. Big medicolegal consequences. Common use cases include teaching facial nerve branching patterns in head and neck anatomy and surgical anatomy courses, illustrating safe planes for submandibular gland excision, rhytidectomy, and neck lift approaches, and supporting atlas figures or review articles on iatrogenic facial nerve injury and postoperative facial asymmetry. It also fits well in ENT and maxillofacial operative manuals where the relationship between the cervical branch, platysma, and superficial venous crossings needs a clear, labeled reference. Anatomical accuracy verified by SciePro's Medical Advisory Board.