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George E. Carvell, PhD, PT   University of Pittsburgh
 
Terminal Cortical branches of the Anterior, Middle and Posterior Cerebral Arteries Anastomose (join) along a zone often termed the watershed zone or Arterial Border Zone. These Leptomeningeal Anastomoses provide an overlap of the 3 arteries on the cortical surface (see color overlap areas in movies). The anastomoses that are well-developed for surface vessels are almost absent for the deep structures fed by small penetrating arterial branches of Circle of Willis that terminate in deep gray and white matter.
ARTERIAL BLOOD SUPPLY: SUPERFICIAL & DEEP ARTERY MOVIES
PLAY THE MOVIES
GMOMM  2001