1. (C)ervical (R)egion 2. (O)rbital 3.(P)etrocavernous.
1. Increased IA pressure (eg, during embolization procedures or superselective injections
2. High-flow shunts as a consequence of the “sump effect,” 3. Occlusions of large arteries with collaterals
11: Musculospinal branch(NMT). 12: Hypoglossal branch.