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Blood is supplied to the brain by the  '''internal carotid artery''' in dogs and horses. In the other domestic species the main blood supply is from branches of the '''maxillary artery'''.

Blood is supplied to the brain by the  '''internal carotid artery''' in dogs and horses. In the other domestic species the main blood supply is from branches of the '''maxillary artery'''.

The '''circle of Willis''' (also called the cerebral arterial circle or arterial circle of Willis) is a circle of arteries that supply blood to the brain.

The '''circle of Willis''' (also called the cerebral arterial circle or arterial circle of Willis) is a circle of arteries that supply blood to the brain.

'''5. Left and right posterior communicating artery'''

'''5. Left and right posterior communicating artery'''

The basilar artery and middle cerebral arteries, though they supply the brain, are not considered part of the circle.

The basilar artery and middle cerebral arteries, though they supply the brain, are not considered part of the circle.

'''4. The connection of the vertibral artery to the internal carotid artery'''

'''4. The connection of the vertibral artery to the internal carotid artery'''

====Dog, man and many other species====

====Dog, man and many other species====

* A mixture of maxillary and vertibral blood reaches '''all parts of the brain'''.

* A mixture of maxillary and vertibral blood reaches '''all parts of the brain'''.

[[Category:Nervous System]]

[[Category:Nervous System - Anatomy & Physiology]]