Which of the following statements is incorrect?

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The right common carotid artery originates from the brachiocephalic trunk.The left common carotid artery arises directly from the aortic arch.The common carotid artery bifurcates into the internal and external carotid arteries at the level of the upper border of the thyroid cartilage.The carotid sinus functions as a chemoreceptor.

Explanation

Option A is true: the right common carotid artery branches from the brachiocephalic artery. Option B is correct: the left common carotid artery arises from the aortic arch. Option C is accurate: the common carotid artery splits into internal and external carotid arteries at the upper border of the thyroid cartilage. Option D is incorrect because the carotid sinus serves as a baroreceptor (pressure sensor), not a chemoreceptor.