Anatomy

Question 1

Blood supply of the spinal cord

Answer 1

3 longitudinal vessels: 2 posterior spinal arteries and 1 anterior spinal artery

Reinforced by segmental feeder arteries

Question 2

Role of the dorsal columns

Answer 2

• Fine touch
• Vibration
• Proprioception

Question 3

Decussation point of the dorsal columns

Answer 3

In the medulla forming the medial lemniscus

Question 4

Role of the spinothalamic tract

Answer 4

Temperature

Pain

Question 5

Sensation provided by the lateral corticospinal tract

Answer 5

Motor

Question 6

Cell body of:

a) Dorsal columns
b) Spinothalamic tract
c) Lateral corticospinal tract

Answer 6

a) DRG
b) DRG
c) Primary motor cortex

Question 7

Ducssation point of the spinothalamic tract

Answer 7

In the cord at the entry level

Question 8

Decussation point of the lateral corticospinal tract

Answer 8

Pyramids in ventral medulla

Question 9

Locations of cranial nerve nuclei

Answer 9

Midbrain: 3,4,(5)

Pons: 5,6,7,8

Medulla: (5),9,10,11,12

All innervate ipsilateral side.

Fibres from trochlear nucleus decussate in medulla and supply cotralateral superior oblique muscle

Question 10

Muscles supplied by:

a) CN3 b) CN 4 c) CN6

Answer 10

a) levator palpebrae superioris, superior rectus, medial rectus, inferior rectus, and inferior oblique muscles
b) Superior oblique
c) Lateral rectus