Vertebrobasilar System: Vertebral Artery

Question 1

Origin

Answer 1

Neck root, from subclavian artery part 1

Question 2

Course of 4th part

Answer 2

1. Vertebral arteries enter skull through foramen magnum
2. Run upwards, forwards, and medial on medulla anterior surface

Question 3

End

Answer 3

At pons lower border where both arteries unite together forming basilar artery

Question 4

Branches

Answer 4

1. Posterior inferior cerebellar artery
2. Posterior spinal artery
3. Anterior spinal artery
4. Medullary branches

Question 5

Largest branch

Answer 5

Posterior inferior cerebellar artery (large name too :(

Question 6

Posterior inferior cerebellar artery course

Answer 6

1. Runs backwards around medulla just below olive
2. Turns around ICP
3. Reach cerebellum inferior surface

Question 7

Posterior inferior cerebellar artery supply

Answer 7

1. Posterior part of cerebellum inferior surface
2. Hemisphere inferior vermis
3. Medulla dorsolateral zone including:
   - ICP
   - 4th ventricle choroid plexus
   - usually gives posterior spinal artery

Question 8

Posterior inferior cerebellar artery occlusion

Answer 8

Lateral medullary syndrome

Question 9

Posterior spinal artery origin

Answer 9

1. Vertebral artery
   Or
2. PICA branch

Question 10

Posterior spinal artery course

Answer 10

Descends to spinal cord along spinal nerves posterior roots

Question 11

Posterior spinal artery supplies

Answer 11

1. Spinal cord posterior 1/3
2. Gracile nuclei
3. Cuneate nuclei

Question 12

Anterior spinal artery origin

Answer 12

2 anterior spinal arteries run obliquely downwards and medial in front of medulla and unite forming a single anterior spinal artery

Question 13

Anterior spinal artery course

Answer 13

Descend along spinal cord anterior median sulcus down to filum terminale

Question 14

Anterior spinal artery supply

Answer 14

1. Spinal cord anterior 2/3
2. Medulla medial zone

Question 15

Anterior spinal artery occlusion

Answer 15

Medial medullary syndrome

Question 16

Medullary branches

Answer 16

Supplies medulla middle zone