Carotid Plexus, Anterior View

Description

Anterior cervical anatomy centers on the common carotid artery ascending deep to the sternocleidomastoid, then bifurcating at the level of C4 into the internal carotid artery (posterolateral) and external carotid artery (anteromedial) with early neck branches. Draped on the arterial adventitia, the carotid plexus forms a periarterial sympathetic network derived from the superior cervical ganglion, with filaments that run superiorly toward the skull base and anteriorly toward the carotid sheath. Inferiorly, the illustration logically includes the clavicles and upper ribs framing the thoracic inlet, while posteriorly the cervical vertebrae provide orientation behind the visceral compartment. Portions of the mandible and maxillary dentition sit superior and anterior to the carotid triangle, marking the transition into the suprahyoid region. Clinically, this view matters because the carotid plexus carries postganglionic sympathetic fibers that travel with the internal carotid artery to the orbit (via the carotid canal and cavernous sinus), supplying the dilator pupillae and the superior tarsal muscle. Injury or interruption anywhere along this pathway during carotid endarterectomy, high cervical dissection, or skull base surgery can contribute to Horner syndrome (ptosis, miosis, anhidrosis), and periarterial sympathetic irritation can be a source of cervicogenic headache patterns. The relationship of the plexus to the carotid bifurcation also reinforces why carotid sinus manipulation can trigger reflex bradycardia, even when the baroreceptors themselves sit in the arterial wall rather than in the nerve network. Use this artwork in head and neck anatomy teaching to anchor the carotid sheath contents and to distinguish periarterial autonomic plexuses from somatic cervical nerves. It also fits well in operative atlases and patient education material covering carotid endarterectomy, cervical sympathetic chain lesions, and skull base approaches where sympathetic fibers hitchhike on the internal carotid artery. Anatomical accuracy verified by SciePro's Medical Advisory Board.