See lecture 13 in anatomy!
Blood supply to the brain is from aortic arch via the subclavian, carotid (common, internal and external) and vertebral arteries.
Common Carotid arteries:
Divide to form:
External / Internal carotid arteries
External carotid arteries:
Supply head external to brain and orbit, including the thyroid, larynx, face, scalp, muscles of mastication.
Internal Carotid arteries:
Supply orbits and most of the cerebrum.
Enter skull through carotid canal in temporal bone.
Divide to form anterior and middle cerebral arteries, which provide 80% of cerebrum.
Blood supply to posterior of brain from right and left vertebral arteries, which pair to form basilar artery, which divides in turn to form posterior cerebral arteries.
Posterior cerebral artery supplies the remaining 20% of the cerebrum.