L6 - Arterial Supply Of Brain

Question 1

Arterial supply of brain structure

Answer 1

Circle of Willis

Question 2

Anterior cerebral artery

Answer 2

Supplies medial cerebral cortex which represents the lower limbs in the homunculus

Question 3

Middle cerebral artery

Answer 3

Supplies the lateral cerebral cortex which represents the upper limb in the homunculus

• lateral frontal and parietal lobe
• superior temporal lobe

Question 4

Anastomoses between anterior cerebral arteries

Answer 4

Anterior communicating artery

Question 5

Internal carotid artery branches

Answer 5

Ophthalmic artery - supplies orbit
Anterior cerebral artery - arches over the corpus callosum and supplies medial cerebral hemispheres
Middle cerebral artery - supplies lateral cerebral cortex and deep white matter
Posterior communicating artery

Question 6

Anastomoses between the anterior and posterior circulations

Answer 6

Posterior communicating arteries

Question 7

Pontine arteries

Answer 7

• supply the anterior surface of the pons and anterior motor pathways
• very small so highly susceptible to damage

Question 8

Locked in syndrome

Answer 8

• Damage to pontine arteries

- Cannot move body accept the eyes

Question 9

Cerebellar arteries

Answer 9

Superior cerebellar arteries - midbrain and cerebellum
Anterior inferior cerebellar arteries - pons and cerebellum
Posterior inferior cerebellar arteries - medulla and cerebellum

Question 10

Anterior spinal artery

Answer 10

• Supplies the anterior 2/3rds of the spinal cord

- can get stroke of the spinal cord commonly due to post surgery aneurysm

Question 11

Vertebral artery

Answer 11

• The 2 vertebral arteries come together to form the basilar artery in the midline
• The basilar artery bifurcates to form the posterior cerebral arteries

Question 12

Posterior cerebral artery

Answer 12

Deep branches supply the thalamus:

• thalamoperforator arteries
• thalamogeniculate arteries
• occlusion can affect samatosensation

Anterior branches run backwards supplying the midbrain and brain stem

Supplies back of cerebrum - occipital lobe and inferior temporal lobe
Occlusion can affect vision

Question 13

Lenticulostriate vessels

Answer 13

Very small branches of the middle cerebral artery supplying the:

• caudate nucleus
• lentiform nucleus
• internal capsule
• putamen and globus pallidus

Question 14

Which artery is commonly involved in stroke

Answer 14

Medial cerebral artery

Question 15

Anterior circulation

Answer 15

Supplied by the internal carotid artery

Supplies most of the cerebral hemispheres

Question 16

Posterior circulation

Answer 16

Supplied by the vertebral arteries

Supplies the cerebellum, brainstem some of the temporal lobe and the occipital lobe