Nerve Pathways

Question 1

posterior/ dorsal pthwy role

Answer 1

fine touch + skin receptors

Question 2

spinocerebellar function

Answer 2

proprioception = GSA

Question 3

where do all 1st motor neurons of the sensory tracts start

Answer 3

peripheral receptor enter CNS via spinal nerve in dorsal root

Question 4

where does post/dorsal pthwy synapse

Answer 4

1- medulla
2- thalamus
3- primary somatosensory cortex = post central gyrus

Question 5

upper limb medulla synapse location for dorsal pthwy

Answer 5

fasciculus cuneatus = lateral column

Question 6

lower limb medulla synapse location for dorsal pthwy

Answer 6

fasciculus gracilis = medial

Question 7

spinocerebellar tract synapses

Answer 7

1- dorsal G horn
2- cerebellar hemisphere

Question 8

spinothalamic tract synapses

Answer 8

1- dorsal G horn
2- thalamus
3- post central gyrus

Question 9

spinothalamic function

Answer 9

pain and temperature

Question 10

spinoreticular tract synapses

Answer 10

1- dorsal G horn
2- medulla + midbrain

Question 11

spinotectal synapses

Answer 11

1- dorsal G horn
2- superior colliculus of midbrain

Question 12

function of spinoreticular pthwy

Answer 12

levels of consciousness

Question 13

spinotectal pthwy function

Answer 13

coordinates eye and head movements ie. look at what you see

Question 14

spinomesencephalic tract synapses

Answer 14

1- dorsal G horn
2- midbrain PAG

Question 15

spinomesencephalic tract function

Answer 15

fear and aversion of pain

Question 16

spino-olivary tract synapses

Answer 16

1- dorsal G horn
2- inferior olivary nucleus (medulla)
3- cerebellum

Question 17

function of spino-olivary pthwy

Answer 17

unconscious proprioception + movement of body + limbs

Question 18

sensory pthwys that decussate

Answer 18

1- dorsal/ post in medulla
2- spinothalamic in G horn
3- spinotectal pthwy at G horn

Question 19

tectospinal function

Answer 19

control of visual stimuli = CN II

Question 20

tectospino starts at:

Answer 20

tectum of midbrain superior colliculus

Question 21

tectospinal tract synapses where

Answer 21

cervical segments of spinal cord

Question 22

vestibulospinal function

Answer 22

maintain balance and posture

Question 23

reticulospinal function

Answer 23

reflexes + inhibit antagonist muscles

Question 24

vestibulospinal synapses where

Answer 24

ant column of spinal column

Question 25

where does vestibulospinal tract start

Answer 25

medulla at lat vestibular nuclei

Question 26

which CN does tectospinal tract impact

Answer 26

CN II

Question 27

which CN does vestibulospinal tract impact

Answer 27

CN VIII

Question 28

recticospinal synapses where

Answer 28

1- pons synapses in pons
2- medulla synapses in medulla

Question 29

which colum does the reticulospinal tract travel down

Answer 29

anterior no cross

Question 30

which column does the medulla travel down

Answer 30

lateral some cross

Question 31

where does corticospinal synapse

Answer 31

1- ant G horn Spinal corn

Question 32

corticospinal tract is what:

Answer 32

voluntary motor movement

Question 33

upper motor neurons result in

Answer 33

spastic

Question 34

lower motor neurons results in

Answer 34

atrophy

Question 35

which column does coticospinal tract take

Answer 35

ant lateral –> ventral root

Question 36

rubriospinal tract starts at:

Answer 36

red nucleus midbrain

Question 37

rubiospinal tract synapses at:

Answer 37

ant G horn

Question 38

motor neurons that decussate

Answer 38

1- tectospinal: ant column of spinal cord
2- corticospinal: medulla
3- rubrospinal: midbrain
4- reticulospinal: medulla SOME

Question 39

post grey horn is [sensory/motor]

Answer 39

sensory

Question 40

anterior grey horn is [sensory/motor]

Answer 40

motor

Question 41

rubrospinal function

Answer 41

muscle tone, posture + skeletal muscle tone