Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
A,B: branches of the anterior cerebral artery. 1, orbital branch; 2, precallosal branch; 3, supracallosal branch; 4, pericallosal branch; I, cingulate arch; II, pericallosal arch.
Variations in the Distribution Pattern of the Anterior Cerebral Artery in 50 Human Brains are Illustrated as 4 Types.
C (type I) A single large stem whose branching pattern runs over the corpus callosum forming the arcus pericallosus. 12 cases in 100 hemispheres studied.
D (type II) Two separate arched vessels, one smaller inner and a larger branched outer vessel forming an arcus pericallosus and arcus cinguli. Found 9 times in 100 hemispheres studied.
E (type III) A detached inner vessel forming an incomplete arcuspericallosus. Found in 10 cases of 100 hemispheres studied.
F (type IV) Found in 60 cases, this type has an incomplete arcus cinguli.
Orbital branch variations: a, absent, no branch, 14%; b, 1 branch, 50%; c, two branches, 30%; d, three branches, 6%. Precallosal branch variations: a, absent, no branch; b, 1 branch, 14%; c, 2 branches, 49%; d, 3 branches, 29%; e, 4 branches, 7% Supracallosal branch variations: a, absent, no branches; b, 1 branch, 10%; c, 2 branches, 28%; d, 3 branches, 31%; e, 4 branches, 20%; f, 5 branches, 9%; and g, 6 branches, 1%.
redrawn from Kleiss, 1941-42.
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