Tracts

Question 1

function pain and temp

Answer 1

lateral spinothalamic

Question 2

function unconscious proprioception

Answer 2

posterior and anterior spinocerebellar

Question 3

function discriminative touch (2 pt), vibration and conscious proprioception

Answer 3

dorsal columns (fasciculus cuneatus and gracilis)

Question 4

function spino visual reflexes; aka spino-quadrigeminal system of Mott

Answer 4

spinotectal

Question 5

function levels of conciousness

Answer 5

spinoreticular

Question 6

function protopathic is defensive to pain, temp, crude light touch

Answer 6

anterior spinothalamic

Question 7

ascending tracts (7)

Answer 7

lateral spinothalamic, anterior spinothalamic, dorsal columns (fasciculus cuneatus and gracilis), posterior and anterior spinocerebellar, spinotectal, spinoreticular

Question 8

lateral spinothalamic pathway (3)

Answer 8

1st DRG
2nd substantia gelatinosa
3rd posterior lateral nucleus of thalamus –> postcentral gyrus

Question 9

anterior spinothalamic pathway (3)

Answer 9

1st DRG
2nd substantia gelatinosa
3rd posterior lateral nucleus of thalamus –> postcentral gyrus

Question 10

dorsal columns pathway (3)

Answer 10

1st DRG
2nd nuclei gracilis/cuneatus
3rd posterior lateral nucleus of thalamus –> postcentral gyrus

Question 11

posterior spinocerebellar pathway (2)

Answer 11

1st DRG

2nd nucleus dorsalis (clarks column) ascend through inferior cerebellar peduncle to cerebellum

Question 12

anterior spinocerebellar (2)

Answer 12

1st DRG

2nd nucleus dorsalis (clarks column) cross segmentally and ascend through superior cerebellar peduncle to cerebellum

Question 13

spinotectal

Answer 13

1st DRG

2nd cross segmentally and ascend to superior colliculus (midbrain)

Question 14

spinoreticular

Answer 14

1st DRG

2nd ascend to nuclei of reticular formation (brainstem)

Question 15

fxn: precise and skilled voluntary movement “threading a needle or writing”

Answer 15

corticospinal (pyramidal) lateral and anterior

Question 16

corticospinal (pyramidal) lateral and anterior origin and destination

Answer 16

o: 1st motor cortex, 2nd motor cortex, parietal lobe
d: internuncial neurons or alpha motor neurons

Question 17

most cross at decussation of pyramids and descend as lateral corticospinal tracts, some continue as anterior corticospinal tracts

Answer 17

lateral corticospinal (length of cord) anterior (stops mid thoracic)

Question 18

fxn: inhibit or facilitate voluntary movement

Answer 18

reticulospinal (pontine and medullary)

Question 19

reticulospinal (pontine and medullary) origin and destination; crosses at various locations

Answer 19

o: reticular formation d: alpha and gamma motor neurons; cross at various locations

Question 20

fxn: reflex postural movement to visual stimuli

Answer 20

tectospinal

Question 21

tectospinal origin and destination

Answer 21

o: superior colliculus (midbrain) EYE d: alpha and gamma motor neuron EAR

Question 22

fxn: facilitates flexors and inhibits extensors; received cerebellar and cerebral information

Answer 22

rubrospinal “red”

Question 23

rubrospinal origin and destination

Answer 23

o: red nucleus (midbrain) d: alpha and gamma motor neurons

Question 24

fxn: facilitates extensors and inhibits flexors; receives inner ear (via vestibular nerve) and cerebellar info

Answer 24

vestibulopinal

Question 25

vestibulospinal origin and destination

Answer 25

o: lateral vestibular nucleus d: alpha and gamma motor neurons

Question 26

+ path reflexes (babinski)

Answer 26

UMNL

Question 27

increased muscle tone, spasticity, hypertrophy, clonus

Answer 27

UMNL

Question 28

increased deep tendon reflex

Answer 28

UMNL

Question 29

decreased superficial reflexes (bilateral)

Answer 29

UMNL

Question 30

no path reflexes

Answer 30

LMNL

Question 31

flaccidity, atrophy, fasciculations

Answer 31

LMNL

Question 32

decreased deep tendon reflex

Answer 32

LMNL

Question 33

decreased superficial reflexes (unilateral)

Answer 33

LMNL