Cortical and Vascular Anatomy

Question 1

central sulcus divides?

Answer 1

motor strip (frontal) from sensory cortex (parietal)

Question 2

upside down omega

Answer 2

central sulcus

Question 3

cingulate sulcus

Answer 3

midline structure

Question 4

finding central sulcus from cingulate sulcus

Answer 4

cingulate sulcus > paracentral lobule (contains motor strip, sensory cortex)

Question 5

branches of ICA

Answer 5

C1: cervical
C2: petrous, skull base
C3: lacerum
C4: cavernous (meningohyphyseal trunk, inferolateral trunk)
C5: clinoid segments
C6-C7: supraclinoid segments (opthalamic, PCA, anterior choroidal artery)

Question 6

recurrent artery of Heubner

Answer 6

supplies caudate head and anterior limb of internal capsule

branch of A1 segment of ACA

Question 7

ACA A1 segment branches

Answer 7

recurrent artery of Heubner

lenticulostriate perforator vessels (medial basal ganglia)

Question 8

lateral lenticulostriate perforate vessels

Answer 8

supply lateral basal ganglia

lateral putamen, external capsule, posterior limb of internal capsule

Question 9

P comm location

Answer 9

between optic tract and CN3

gives off anterior thalamoperforator vessles

aneurysm here will cause CN3 palsy due to local mass effect

Question 10

artery of percheron

Answer 10

PCA branch, P1

thalamoperforators which supply ventromedial thalami and rostral midbrain

Question 11

most distal branch of ICA

Answer 11

anterior choroidal artery

supplies optic chiasm, hippocampus, posterior limb of internal capsule

Question 12

segments of MCA

Answer 12

M1: squamous/horizontal segment
M2: after bifurcation; to top of sylvian fissure
M3: sylvian fissure to cortical surface
m4: small cortical branches

Question 13

ACA segments

Answer 13

A1: proximal to Acomm (recurrent artery of Heubner)
A2: (orbitofrontal, frontopolar, pericallosal)
A3: callosomarginal arery (anterior internal frontal artery, middle internal frontal artery, posterior internal frontal artery, paracentral artery)

Question 14

persistent carotid-basilar connections

Answer 14

persistent trigeminal artery (trident/tau sign)

persistent otic, hypoglossal, proatlanta intersegmental arteries

Question 15

persistent trigeminal artery

Answer 15

courses adjacent trigeminal nerve

Saltzman type I: connects to basilar artery

Saltzman type II: connects superior cerebellar artery