Carotid Sheath

vagina carotica

The carotid sheath is a fibrous condensation of deep cervical fascia enclosing the common and internal carotid arteries, the internal jugular vein, and the vagus nerve, running from the skull base to the aortic arch.

Anatomical Data

Boundaries & Contents

Location	Side of the neck, from the base of the skull to the root of the neck, deep to sternocleidomastoid
Boundaries	Formed by contributions from the investing, pretracheal and prevertebral layers of deep cervical fascia Above: base of the skull around the carotid canal and jugular foramen Below: root of the neck, continuous with the connective tissue around the great vessels Behind: prevertebral fascia and the cervical sympathetic trunk
Contents	Common carotid artery and, above its bifurcation, the internal carotid artery Internal jugular vein Vagus nerve Deep cervical lymph nodes Ansa cervicalis (embedded in or on its front wall)

Biomechanics

Function & Actions

Binds and protects the main arteries, vein and nerve of the neck in one fibrous tube.

Clinical Relevance

Clinical Notes

The carotid sheath is the key surgical landmark in anterior cervical approaches. It is identified and retracted laterally to access the vertebral bodies. Carotid sheath tumours (paragangliomas, neurogenic tumours) displace the carotid and jugular rather than invading the sheath in early stages. Carotid sheath infection (suppurative jugular thrombophlebitis, Lemierre syndrome) is a rare but life-threatening complication of oropharyngeal infection.

Pathology

Common Injuries & Conditions

Lemierre Syndrome, Carotid Sheath Infection

Suppurative jugular thrombophlebitis spreading to the carotid sheath from oropharyngeal sepsis, producing septic emboli and requiring IV antibiotics and anticoagulation.

Carotid Sheath Paraganglioma

Carotid body tumour arising within the carotid sheath bifurcation splaying the internal and external carotid arteries, managed by surgical excision with embolisation for large tumours.

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