Segments of ACA
Segment | End | Branches | |
A1 | PRE-communicating | Origin to ACOM | |
A2 | POST-communicating | ACOM to A3 | - RAH: recurrent artery of Heubner - orbitofrontal artery - frontopolar artery - anterior inferior frontal artery |
A3 | precallosal | ||
A4 | supracallosal | ||
A5 | postcallosal |
Recurrent Artery of Heubner (A2 branch)
supplies: caudate head, anterior lentiform nucleus, anterior limb of IC, inferior frontal lobe, septal nuclei
- arises from Acomm usually distal then courses backwards to proximal A1
- can be injured during Acomm surgery
- unilateral RAH infarct → contralateral arm/face weakness, dysarthria, akinetic mutism, hemichorea
- bilateral RAH infarcts → akinetic mutism
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