Internal Carotid Artery - Segments & Branches 

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The internal carotid artery arises from the common carotid artery where this bifurcates into the internal and external carotid arteries at cervical vertebral level 3 or 4. The internal carotid artery terminates in the skull by dividing into middle carebral and anterior cerebral arteries.
Clinically the classification system of the internal carotid artery describes 7 anatomical segments each with a corresponding alphanumeric identifier from C1 to C7.
The internal carotid artery can receive blood flow via an important collateral pathway supplying the brain, the cerebral arterial circle, which is more commonly known as the Circle of Willis.
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