spinal cord and periphery

Question 1

ventral root

Answer 1

motor

Question 2

dorsal root

Answer 2

sensory

Question 3

white matter

Answer 3

central

arranged in 3 columns - posterior, lateral, anterior

Question 4

ascending pathways

Answer 4

sensory

Question 5

descending pathways

Answer 5

motor

Question 6

corticospinal tract

Answer 6

carrier motor impulses from motor cortex to skeletal muscles

Question 7

posterior/dorsal column

Answer 7

carries touch, tactile localisation, vibration sense, proprioception

Question 8

lateral spinothalamic tract

Answer 8

pain and temperature

Question 9

where does corticospinal tract start from

Answer 9

motor cortex area 4

Question 10

how many neurones in corticospinal tract

Answer 10

2

upper motor neuron and lower motor neuron

Question 11

corticospinal tract: where does dessecation tale place

Answer 11

pyramidal decussation in medulla

Question 12

how many neurones in ascending spinal tracts

Answer 12

3
1st order neuron
2nd order neuron
3rd order neuron

Question 13

where do the different neurones in asc spinal tracts synspase/change

Answer 13

1st order to 2nd at grey matter of spinal cord or nucleus in medulla

2nd-3rd nucleus in contralateral thalamus

Question 14

posterior/dorsal column route

Answer 14

1st ON ends by synapsing w cell body on 2nd ON in lower part medulla

2nd ON desuccates in medulla (tract is now medial lemniscus) and passes theough medulla, pons and midbrain to thalamus

3rd ON starts from thalamus and axons pass through IC and radiate to post central gyrus (area 2,1,3)

Question 15

lateral spinothalamic tract route

Answer 15

1st ON enters into grey matter and ends at same level

2nd ON crosses over to reach lateral column and is now laeral spinpthalamic tract

2nd ON ends in thalamus and 3rd ON passes through IC, radiation to reach post-central gyrus

Question 16

where does decussation occur lateral spinothalamic tract

Answer 16

level of entry

Question 17

relfex

Answer 17

involuntary stereotyped pattern of response brought about by sensory stimulus

many are mediated at level of spinal cord (spinal reflexes)

Question 18

corticospinal tract: UMN lesion above decussation

Answer 18

contraleteral spastic paralysis

hyperreflexia

Question 19

corticospinal tract: UMN lesion below decussation

Answer 19

ipsilateral spastic paralysis and hyperreflexia

Question 20

corticospinal tract: LMN lesion

Answer 20

ispsilateral flaccid paralysis

arreflexia

Question 21

posterior/dorsal column: lesion above decussation

Answer 21

contralateral sensory loss

Question 22

posterior/dorsal column: lesion below decussation

Answer 22

ipsilateral sensory loss

Question 23

lateral spinothalamic tract: lesion above decussation

Answer 23

pain and temp sensation lost on oposite side