Pathways

Question 1

Spinothalamic

Answer 1

Pain, temperature, crude touch from body

Question 2

Trigeminothalamic

Answer 2

Pain, temperature, crude touch from face

Discriminative touch, conscious proprioception from face

Question 3

Dorsal column-medial lemniscus system (DCML)

Answer 3

Discriminative touch, conscious proprioception from body

Question 4

Dorsal spinocerebellar/cuneocerebellar

Answer 4

Nonconscious proprioception

Question 5

Ventral spinocerebellar

Answer 5

Nonconscious proprioception

Question 6

Corticospinal

Answer 6

Voluntary motor to body

Question 7

Corticobulbar

Answer 7

Voluntary motor to head

Question 8

Cerebellum, Basal ganglia

Answer 8

Adjustment, fine-tuning systems

Question 9

Location of neurons of Spinothalamic tract
Neuron 1:
Neuron 2:
Neuron 3:

Answer 9

1: DRG
2: Spinal cord (dorsal horn) –> axon decussates
3: Thalamus

Question 10

Lesion here results in loss/decrease of pain and temperature sensation

Answer 10

Spinothalamic tract

Question 11

Location of neurons of DCML
Neuron 1:
Neuron 2:
Neuron 3:

Answer 11

1: DRG
2: Medulla –> axons cross medulla –> ascend in contralateral medial lemniscus
3: Thalamus

Question 12

Lesion of this pathway lead to loss of diminution of 2 point discrimination, vibration sense, limb position sense, kinesthesia

Answer 12

DCML

Question 13

Information in spinocerebellar tracts mostly comes from ____ and ____.

Answer 13

muscle spindles

Golgi tendon organs

Question 14

Signals ascend to ___ in spinocerebellar tracts.

Answer 14

Cerebellum

Question 15

Lesions of spinocerebellar pathways

Answer 15

Do not usually produce obvious signs

Question 16

Lateropulsion can occur during lesions of

Answer 16

Spinocerebellar pathways

Question 17

Two components of corticobulbospinal tract

Answer 17

Corticospinal system

Corticobulbar system

Question 18

2-neuron pathway

Answer 18

Corticobulbospinal system

Question 19

The majority of corticospinal fibers cross in ___ to form the ____. They descend in the _____, and synapse on _____ in ____ .

Answer 19

Pyramidal decussation of lower medulla
Lateral corticospinal tract
Lateral funiculus
LMN 
Ventral horn at every level of spinal cord

Question 20

Uncrossed corticospinal fibers form ____ and descend in the ___. They cross in the ____ to synapse on ____ in the _____.

Answer 20

Anterior corticospinal tract
Ventral funiculus
Ventral white commissure of the spinal cord
LMN
contralateral ventral horn

Question 21

____ results from loss of inhibition of stretch reflex which normally maintains ____

Answer 21

Hypertonia

Muscle tone

Question 22

____ results from loss of inhibition of the lower motor neuron

Answer 22

Exaggerated deep tendon reflexes

Question 23

All motor pathways from all levels of the motor system eventually converge on ____

Answer 23

Lower motor neurons

Question 24

Lesions of LMNs causes ____

Answer 24

loss of signals to generate muscle contraction and neurotrophic input

Question 25

Causes weakness/paressi/paralysis

Answer 25

Lesions to LMNs

Question 26

Causes decreased/abolished deep tendon reflexes

Answer 26

Lesions to LMNs

Question 27

Causes muscle atrophy and fasciculation

Answer 27

Lesions to LMNs

Question 28

Causes hypotonia

Answer 28

(Flaccidity)

Lesions to LMNs

Question 29

____ provides error correction for motor system

Answer 29

Cerebellum

Question 30

____ allows for learning of complex motor tasks

Answer 30

Basal ganglia

Question 31

____ are first order neurons in the somatosensory pathway.

Answer 31

Dorsal root ganglion neurons