Greenberg's - Vascular Anatomy Flashcards
Origin: Recurrent artery of Heubner = medial striate artery
Junction of the ACA and A-Comm in 62%
Proximal A2 in 23%
A1 14%
Angiography: Circle of Willis
A balanced configuration of the CoW is present in only 18% of population
Hypoplasia of 1 or both p-comms occurs in 22-32%
- Absent or hypoplastic A1 segments occurs in 25%
The ACA pass over the superior surface of the optic chiasm
Anterior Cerebral Artery - A1
Precommunicating
ACA from origin to ACoA
Anterior Cerebral Artery - A2
Postcommunicating
ACA from ACoA to branch-point of callosmarginal
Anterior Cerebral Artery - A3
Precallosal
From branch-point of callosomarginal curving around the genu of the corpus callosum to superior surface of corpus callosum 3cm posterior to the genu
Anterior Cerebral Artery - A4
Supracallosal
Anterior Cerebral Artery - A5
Postcallosal
Terminal branch
Middle Cerebral Artery - M1
MCA from origin to bifurcation
- Classical bifurcation into relatively symmetrical superior and inferior trunks is seen in 50%
- No bifurcation occurs in 2%
25% have a proximal branch (middle trunk) arising from the superior (15%) or inferior (10%) trunk creating a pseudotrifurcation
Pseudotetrafurcation occurs in 5%
Segments of the ICA - Cincinnati system
C1 cervical C2 petrous C3 lacerum C4 cavernous C5 clinoid C6 ophthalmic C7 communicating
Middle Cerebral Artery - M2
MCA trunks from bifurcation to emergence from Sylvian fissure
Middle Cerebral Artery - M3 to 4
Distal branches
Middle Cerebral Artery - M5
Terminal branch
Posterior Cerebral Artery - P1
PCA from origin to P-Comm artery
- Long and short circumflex and thalamoperforating arteries arise from P1
Posterior Cerebral Artery - P2
PCA from origin of P-Comm to the origin of inferior temporal arteries
P2 traverses the ambient cistern
Hippocampal, anterior temporal, peduncular perforating and medial posterior choroidal arteries arise from P2
Posterior Cerebral Artery - P3
PCA from origin of the inferior temporal branches to the origin of the terminal branches
P3 traverses the quadrigeminal cistern