Middle Cerebral Artery

Question 1

What marks the beginning of the M3 segement?

Answer 1

Top of the sylvian fissure

Question 2

The M1 segment courses beneath which structure?

Answer 2

Anterior perforated substance

Question 3

What branches from M1?

Answer 3

Lenticulostriate (medial and lateral) and the anterior temporal artery

Question 4

If an MCA
bifurcates within __ mm of its origin from the internal carotid artery, it is called an early bifurcating MCA.
This is a normal variant.

Answer 4

10

Question 5

At the _______, the M I segment ends by turning

posterosuperiorly to form the knee or genu.

Answer 5

limen insulae, (a small gyrus located near the

anteroinferior corner of the insula)

Question 6

What angiographic structure approximates the apex of the insula and represents the posterior limit of the lateral
cerebral sulcus?

Answer 6

Angiographic sylvian point

The highest and most medial point where the last cortical
MCA branch (usually the angular artery) turns infeolaterally to exit the sylvian fissure is termed the angiographic sylvian point.

Question 7

What forms the angiographic sylvian triangle?

Answer 7

1. Superior insular line– formed by the apices of the M2 at the top of the insula
2. The main MCA trunk
3. the most anterior anterior branche of the ascending frontal complex (anterior)

Question 8

Displacement or deformation of the
angiographic sylvian triangle usually indicates
______.

Answer 8

an intracranial mass

Question 9

Enumerate the branches of the MCA starting with the temporopolar artery going anteriorly

Answer 9

1. Anterior temporal and temporopolar arteries
2. Orbitofrontal artery
3. Prefrontal arteries
4. Precentral sulcus artery
5. Central sulcus artery
6. Anterior parietal (postcentral sulcus) artery
7. Posterior parietal artery
8. Temporopolar artery
9. Anterior Temporal
10. Middle Temporal
11. Posterior Temporal
12. Temporooccipital
13. Angular
14. Posterior parietal

OPPRA
TAMPTAP

Question 10

Which temporal arteries may arise as branches of the M1 segment or the ACA?

Answer 10

M1: Anterior temporal arteries
ACA: Temporopolar artery

Question 11

What branch of the ACA can overlap the supply of the Lenticulostriate branches (<

Answer 11

Recurrent artery of Heubner