頸內動脈,大腦中動脈與大腦前動脈的立體影像 連結

The ACA is divided at the AComA
proximal (precommunicating)
A1 segment: above the chiasm or optic nerve, 7.2-18 mm long,
distal (post-communicating)
A2 (infracallosal)
A3 (precallosal)
A4 (supracallosal)
A5 (posterocallosal)

A-com
Average diameter 1.2 mm if bilateral A1 difference < 0.5 mm, 2.5 mm if difference more than 0.5 mm.
One a-com 60%, 2 a-com 30%, 3 a-com 10%

Recurrent artery of Heubner
Arise from A1 or proximal 0.5 mm A2.
To anterior perforated substance.
Anterior part of caudate n., anterior 1/3 putamen, anterior part of outer segment of internal capsule, uncinate faciculus and less commonly, anterior hypothalamus
Occlusion may cause hemiparesis with facial and brachial predominance (anterior limb of internal capsule), and aphasia if on dominant side.

Basal perforating branches
From A1, A2 and A-com
To anterior perforated substance, dorsal surface of chiasm, suprachiasmatic portion of hypothalamus, optic tract, dorsal surface of optic nerve.
Involve hypothalamus branch may induce emotional change, personality disorder, intellectual dificit (anxiety, fear, weak spell), dizziness, agitation and hypokinesis without paralysis.
Combined recurrent artery and A1 branch produce hemiparesis with brachial predominance. (Distal ACA occlusion produce leg weakness)

Pericallosal artery
Portion of ACA distal to A-com and on the corpus callosum.

Callosomargimal artery
The largest branch of pericallosal artery, course in or near the cingulate sulcus and give 2 or more cortical branches.