ANATOMY

Detailed explanation-1: -There are four carotid arteries, with a pair located on each side of the neck. This includes the right-and left-internal carotid arteries, and the right-and left-external carotid arteries. The carotid arteries deliver oxygen-rich blood from the heart to both the head and brain.

Detailed explanation-2: -The carotid arteries originate posterior to the sternoclavicular joints and in the neck, they are contained within the carotid sheath posterior to the sternocleidomastoid muscle.

Detailed explanation-3: -The carotid bodies are small (≈2 mm diameter in humans) sensory organs located near the carotid sinus at the bifurcation of the common carotid artery at the base of the skull. The aortic bodies are on the aortic arch near the aortic arch baroreceptors.