Common carotid bifurcation occurs around which cervical level?

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The common carotid artery typically splits into the internal and external carotid arteries around the level of the upper border of the thyroid cartilage, which corresponds to about the fourth cervical vertebra. This is a standard neck landmark because the carotid sheath contains both vessels and the split occurs near that point, with the internal carotid heading upward to supply the brain (without branching in the neck) and the external carotid continuing to give off its neck and facial branches. The other options place the bifurcation too high (near the mandible) or too superior (base of the skull) or too inferior (arch of the aorta in the thorax) to be the typical location.