Neuroanatomy Revision Night: Spinal Tracts

Question 1

2 main ascending tracts?

Answer 1

DCML

spinothalamic

Question 2

if a tract starts with “spino” is it an ascending or descending tract?

Answer 2

usually ascending

Question 3

where does the first order neuron in DCML end?

Answer 3

medulla

Question 4

where does the 2nd order neuron in DCML end?

Answer 4

ventral posterolateral nucleus

Question 5

where does the 3rd order neuron in DCML end?

Answer 5

postcentral gyrus

Question 6

anything above T6 enters through the fasciculus ___ of the DCML tract

Answer 6

cuneatus

Question 7

anything above T6 enters through the fasciculus ___ of the DCML tract

Answer 7

gracilis

Question 8

what order neuron performs the horizontal decussation seen in the spinothalamic tract?

Answer 8

2nd order

Question 9

all sensory tracts synapse in the thalamus T or F

Answer 9

T

Question 10

what is the 3rd main ascending tract

Answer 10

spinocerebellar

Question 11

pyramidal tracts originate from…

Answer 11

precentral gyrus

Question 12

extrapyramidal tracts originate from..

Answer 12

the brainstem

Question 13

pyramids are located?

Answer 13

lower medulla

Question 14

what part of the corticospinal tract decussates segmentally ie NOT AT THE PYRAMIDS?

Answer 14

anterior

Question 15

corticobulbar tract controls….

Answer 15

eyes

tongue

Question 16

what are the only nerves to not have bilateral corticobulbar fibres

Answer 16

lower part of facial
hypoglossal nerve
these only get contralateral

Question 17

name the 4 extrapyramidal tracts?

Answer 17

vestibulospinal
tectospina
reticulospinal
rubrospinal

Question 18

tract for supply of anti-gravity muscles?

Answer 18

vestibulospinal

Question 19

origin of tectospinal tract

Answer 19

tectum of midbrain

Question 20

origin of rubrospinal tract

Answer 20

red nucleus in midbrain

Question 21

reticulospinal excites/inhibits extensors and excites/inhibits flexors

Answer 21

rEticulospinal Excites Extensors

inhibits flexors

Question 22

rubrospinal excites/inhibits extensors and excites/inhibits flexors

Answer 22

inhibits extensors and excites flexors

Question 23

what kind of posturing is a result of the reticulospinal tract

Answer 23

decerebrate posturing

Question 24

what happens in a complete cord injury?

Answer 24

complete loss of sensory and motor innervation below the lesion

Question 25

presentation of central cord syndrome

Answer 25

upper limb and not lower limb weakness as well as some sensory loss due to laceration of the medial corticospinal tract

Question 26

presentation of BS syndrome

Answer 26

contralateral loss of pain and temp (segmental crossing of spinothalamic) ipsilateral loss of touch and vibration (DCML) ipsilateral loss of motor function (corticospinal)

Question 27

presentation of anterior cord syndrome

Answer 27

motor loss pain and temp loss sparing of proprioception

Question 28

most common cause of anterior cord syndrome

Answer 28

anterior spinal cord infarct

Question 29

what pathway is spared in anterior cord syndrome

Answer 29

DCML