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Flashcards in Pathways Deck (31):
1

Spinothalamic

Pain, temperature, crude touch from body

2

Trigeminothalamic

Pain, temperature, crude touch from face
Discriminative touch, conscious proprioception from face

3

Dorsal column-medial lemniscus system (DCML)

Discriminative touch, conscious proprioception from body

4

Dorsal spinocerebellar/cuneocerebellar

Nonconscious proprioception

5

Ventral spinocerebellar

Nonconscious proprioception

6

Corticospinal

Voluntary motor to body

7

Corticobulbar

Voluntary motor to head

8

Cerebellum, Basal ganglia

Adjustment, fine-tuning systems

9

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

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

10

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

Spinothalamic tract

11

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

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

12

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

DCML

13

Information in spinocerebellar tracts mostly comes from ____ and ____.

muscle spindles
Golgi tendon organs

14

Signals ascend to ___ in spinocerebellar tracts.

Cerebellum

15

Lesions of spinocerebellar pathways

Do not usually produce obvious signs

16

Lateropulsion can occur during lesions of

Spinocerebellar pathways

17

Two components of corticobulbospinal tract

Corticospinal system
Corticobulbar system

18

2-neuron pathway

Corticobulbospinal system

19

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

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

20

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

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

21

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

Hypertonia
Muscle tone

22

____ results from loss of inhibition of the lower motor neuron

Exaggerated deep tendon reflexes

23

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

Lower motor neurons

24

Lesions of LMNs causes ____

loss of signals to generate muscle contraction and neurotrophic input

25

Causes weakness/paressi/paralysis

Lesions to LMNs

26

Causes decreased/abolished deep tendon reflexes

Lesions to LMNs

27

Causes muscle atrophy and fasciculation

Lesions to LMNs

28

Causes hypotonia

(Flaccidity)
Lesions to LMNs

29

____ provides error correction for motor system

Cerebellum

30

____ allows for learning of complex motor tasks

Basal ganglia

31

____ are first order neurons in the somatosensory pathway.

Dorsal root ganglion neurons