Carotid Body Location
The carotid bodies are bilateral sensory organs located at the bifurcation of the common carotid artery, where it divides into the internal and external carotid arteries 1, 2, 3, 4.
Anatomical Details
The carotid bodies sit at the carotid bifurcation, which typically occurs at the level of the thyroid cartilage in the neck 5. However, this bifurcation point can vary by up to 5 cm higher or lower than this typical landmark 5.
Key Anatomical Relationships
- Bilateral location: One carotid body exists on each side of the neck at the respective carotid bifurcations 1
- Proximity to carotid bulb: The carotid body is positioned near the carotid bulb, which is the dilated portion at the origin of the internal carotid artery that extends superiorly for approximately 2 cm 5
- Innervation: The carotid bodies are innervated by the carotid sinus nerve (Hering's nerve), a branch of the glossopharyngeal (IX cranial) nerve 4
Clinical Imaging Considerations
The carotid bodies are small structures that can be visualized on contrast-enhanced imaging studies. On CT and MRI, they typically measure approximately 19-21 mm³ in volume 6. Their location at the carotid bifurcation makes them accessible to clinical assessment during vascular imaging of the neck.
Important Caveat
While the carotid bodies are consistently located at the carotid bifurcation, the exact vertebral level varies between individuals due to anatomical variation in where the common carotid artery bifurcates 5.