Sensorimotor Tracts

Question 1

what are the pyramidal tracts?

Answer 1

lateral and anterior corticospinal tracts

Question 2

what are the extrapyramidal tracts?

Answer 2

rubrospinal, reticulospinal, and vestibulospinal tracts

Question 3

what are the 2 spinocerebellar tracts?

Answer 3

posterior and anterior spinocerebellar tracts

Question 4

which pathways are motor/descending/efferent?

Answer 4

pyramidal and extrapyramidal tracts

Question 5

which tract contains the longest neurons in the body?

Answer 5

fasciculus gracilis

Question 6

which tract is responsible for LE discriminative sensory?

Answer 6

fasciculus gracilis

Question 7

what are the components of epicritic (discriminative) sensory?

Answer 7

deep touch, 2pt and vibration, conscious proprioception

Question 8

where does fasciculus gracilis enter the spinal cord?

Answer 8

dorsal root ganglion

Question 9

in what part of the spinal cord does fasciculus gracilis travel?

Answer 9

white matter of medial dorsal column pathway

Question 10

where do the primary and secondary neurons synapse in fasciculus gracilis?

Answer 10

medulla

Question 11

where does the secondary neuron of fasciculus gracilis crosses midline?

Answer 11

medulla

Question 12

where do the secondary and tertiary neurons synapse in fasciculus gracilis?

Answer 12

thalamus

Question 13

what is the ultimate destination of fasciculus gracilis?

Answer 13

sensory cortex

Question 14

which tract does UE discriminative sensory, including fine touch, 2pt and vibration discrimination, conscious proprioception, stereognosis?

Answer 14

fasciculus cuneatus

Question 15

with fasciculus cuneatus, where does the primary neuron enter the spinal cord?

Answer 15

dorsal root ganglion

Question 16

with fasciculus cuneatus, where do the primary and secondary neurons synapse?

Answer 16

medulla

Question 17

with fasciculus cuneatus, where does the secondary neuron cross midline?

Answer 17

medulla

Question 18

with fasciculus cuneatus, where do the secondary and tertiary neurons synapse?

Answer 18

thalamus

Question 19

with fasciculus cuneatus, where does the tertiary neuron ultimately end up?

Answer 19

sensory cortex

Question 20

which tract is responsible for unconscious proprioception?

Answer 20

spinocerebellar tract

Question 21

what are golgi tendon organs sensitive to?

Answer 21

pressure

Question 22

what are muscle spindles sensitive to?

Answer 22

stretch

Question 23

with the spinocerebellar tract, where does the primary neuron enter the spinal cord?

Answer 23

dorsal root ganglion

Question 24

with the spinocerebellar tract, where does the primary neuron travel when heading towards the brain?

Answer 24

gray matter

Question 25

with the spinocerebellar tract, where do the primary and secondary neurons synapse?

Answer 25

dorsal horn of spinal cord

Question 26

with the spinocerebellar tract, where does the secondary neuron ultimately synapse?

Answer 26

inferior cerebellar peduncle

Question 27

which tract is protopathic (protective) and detects pain and temperature?

Answer 27

lateral spinothalamic tract

Question 28

what are the receptors that detect temperature?

Answer 28

free nerve endings

Question 29

where does the lateral spinothalamic tract enter the gray matter of the spinal cord?

Answer 29

dorsal horn of spinal cord

Question 30

with the lateral spinothalamic tract, where does the tract cross midline?

Answer 30

within gray matter of spinal cord

Question 31

with the lateral spinothalamic tract, where do the primary and secondary neurons synapse?

Answer 31

within gray matter of spinal cord

Question 32

with the lateral spinothalamic tract, what does the secondary neuron travel through as it heads towards the thalamus?

Answer 32

lateral white matter

Question 33

with the lateral spinothalamic tract, where do the secondary and tertiary neurons synapse?

Answer 33

thalamus

Question 34

with the lateral spinothalamic tract, where does the tertiary neuron ultimately end up?

Answer 34

sensory cortex

Question 35

which tract is protopathic and detects coarse touch (pressure, pleasant touch, tickle, itch)?

Answer 35

ventral spinothalamic tract

Question 36

with the ventral spinothalamic tract, where does the primary neuron enter the spinal cord?

Answer 36

dorsal horn

Question 37

with the ventral spinothalamic tract, where does the tract cross midline?

Answer 37

within gray matter of spinal cord

Question 38

with the ventral spinothalamic tract, where do the primary and secondary neurons synapse?

Answer 38

within gray matter of spinal cord

Question 39

with the ventral spinothalamic tract, where do the secondary and tertiary neurons synapse?

Answer 39

thalamus

Question 40

with the ventral spinothalamic tract, where does the tertiary neuron ultimately synapse?

Answer 40

sensory cortex

Question 41

which tract is responsible for voluntary motor control and fractionation of movement?

Answer 41

corticospinal tract

Question 42

with the corticospinal tract, what is the origin of the primary neuron?

Answer 42

M1

Question 43

with the corticospinal tract, through what 2 structures does the primary neuron pass before entering the brainstem?

Answer 43

corona radiata, then internal capsule

Question 44

with the corticospinal tract, where do the primary and secondary neurons synapse?

Answer 44

medulla

Question 45

where does the corticospinal tract split to descend in 2 tracts?

Answer 45

medulla

Question 46

what are the 2 corticospinal tracts of the secondary neuron?

Answer 46

ventral and lateral corticospinal tracts

Question 47

10-20% of fibers of the corticospinal tract stay ipsilateral with this tract

Answer 47

ventral corticospinal tract

Question 48

80-90% of fibers of the corticospinal tract cross contralaterally with this tract

Answer 48

lateral corticospinal tract

Question 49

where does the secondary neuron of the ventral corticospinal tract ultimately synapse?

Answer 49

ventral horn of spinal cord

Question 50

with the lateral corticospinal tract, where do the secondary and tertiary neurons synapse?

Answer 50

ventral horn

Question 51

with the lateral corticospinal tract, at what point does the UMN synapse with the LMN?

Answer 51

synapse of secondary and tertiary neurons in ventral horn

Question 52

with the lateral corticospinal tract, where does the tertiary neuron ultimately synapse?

Answer 52

effector muscle

Question 53

which tract extends the wrist and fingers?

Answer 53

rubrospinal tract

Question 54

with the rubrospinal tract, what is the origin of the primary neuron?

Answer 54

red nucleus of midbrain

Question 55

where does the rubrospinal tract cross midline?

Answer 55

midbrain

Question 56

with the rubrospinal tract, through what does the primary neuron travel as it descends?

Answer 56

lateral column

Question 57

with the rubrospinal tract, where do the primary and secondary neurons synapse?

Answer 57

ventral horn

Question 58

with the rubrospinal tract, where does the secondary neuron ultimately synapse?

Answer 58

effector muscle

Question 59

with the reticulospinal tract, what is the origin of the primary neuron?

Answer 59

midbrain

Question 60

which tract is responsible for postural control, overall muscle tone, bilateral motor control, and arousal?

Answer 60

the reticulospinal tract

Question 61

what is the structure in the brainstem that belongs to the reticulospinal tract?

Answer 61

reticular formation

Question 62

at what point does the reticulospinal tract become 2 pathways?

Answer 62

ventral horn

Question 63

which pathway of the reticulospinal tract is responsible for control of antigravity extension (posture)?

Answer 63

medial reticulospinal tract

Question 64

which pathway of the reticulospinal tract is responsible for control of axial extension (bilateral gross motor, stepping pattern generator)?

Answer 64

lateral reticulospinal tract

Question 65

where does the primary neuron of the medial reticulospinal tract ultimately synapse?

Answer 65

white matter of spinal cord

Question 66

with the lateral reticulospinal tract, where do the primary and secondary neurons synapse?

Answer 66

white matter of spinal cord

Question 67

with the lateral reticulospinal tract, where does the secondary neuron ultimately synapse?

Answer 67

effector muscle (leg)

Question 68

which tract is responsible for balance, posture, and head stabilization?

Answer 68

vestibulospinal tract

Question 69

which pathway of the vestibulospinal tract controls the neck and upper back?

Answer 69

medial vestibulospinal tract

Question 70

which pathway of the vestibulospinal tract controls the trunk and lower back posture?

Answer 70

lateral vestibulospinal tract

Question 71

with BOTH vestibulospinal tracts, where do the primary neurons originate?

Answer 71

medulla

Question 72

with the medial vestibulospinal tract, where do the primary and secondary neurons synapse?

Answer 72

ventral horn

Question 73

with the medial vestibulospinal tract, where does the secondary neuron ultimately synapse?

Answer 73

neck/upper back

Question 74

with the lateral vestibulospinal tract, where do the primary and secondary neurons synapse?

Answer 74

ventral horn

Question 75

with the lateral vestibulospinal tract, were does the secondary neuron ultimately synapse?

Answer 75

trunk/lower back