A2 segment of the anterior cerebral artery [Neurosurgery Wiki]

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====== A2 segment of the anterior cerebral artery ======



{{::a2fork.png?300|}}

https://www.researchgate.net/profile/Antti_Ronkainen/publication/5399737/figure/fig1/AS:277905037905926@1443269132245/Fig-1-Illustration-demonstrating-branches-and-segments-of-ACA.png

The [[anterior cerebral artery]] ascending segment consists of A2 and A3, and its horizontal segment consists of A4 and A5. 

A2 (vertical): from the [[anterior communicating artery]], extending anterior to the [[lamina terminalis]] and along the [[rostrum]] of the [[corpus callosum]], terminating either at the [[genu]] of the corpus callosum or at the origin of the [[callosomarginal artery]]

{{::anteriorclinoidprocess.jpg|}}

AC: [[anterior clinoid process]]; ICA: [[internal carotid artery]]; LT: [[lamina terminalis]]; ON: [[optic nerve]]; OlN; [[olfactory nerve]]; SW: [[sphenoid wing]]; TS: [[tuberculum sellae]]; A1: [[A1 segment of the Anterior Cerebral Artery]]; A2: A2 segment of the [[Anterior Cerebral Artery]]; M1: M1 segment of the [[Middle Cerebral Artery]].

Picture from http://3dneuroanatomy.com

===== Pathology =====
see [[Proximal pericallosal artery aneurysm]] or A2 anterior cerebral artery aneurysm