Fig. 2. Patterns of rat cerebral arterial collaterals made
visible with Vultex. A and C demonstrate collateral units
composed of end-to-end rami. Inter- and intraarterial
anastomoses indicated hy circles and stars respectively
Stars outside the unit's boundary in A and C indicate intraarterial
anastomoses are not confined within a unit. R is a
view of a vascular complex with end-to-side branches. Vein
(V). x 15.