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George E. Carvell, PhD, PT   University of Pittsburgh
 
ARTERIAL BLOOD SUPPLY: CIRCLE OF WILLIS
The Internal Carotid Arteries feed the Anterior (Carotid) Circulation and the Vertebral Arteries feed the Posterior (Vertebrobasilar) Circulation
Modified from BC&P Chapt 7 Appendix p 236
GMOMM  2001
Anterior Spinal Artery