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Arteries of the Neck and Head

...  brain. Both the posterior communicating artery and the posterior cerebral artery can be found inside the circle of Willis. The left common carotid artery, in turn, divides and forms the ICA or the internal carotid artery and the ECA or the external carotid artery. It is the internal carotid artery that supplies blood to the brain, while the external carotid artery is responsible for the blood  ...

External Carotid Arteries

...  carotid artery. There are two common carotid arteries, and these arteries supply oxygenated blood to the head and neck. The common carotid artery bifurcates into the external carotid artery and the internal carotid artery. The external carotid artery supplies blood to the exterior of the head, the face and the greater part of the neck. On the other hand, the internal carotid artery supplies  ...