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Flashcards in Other Motor Pathways Deck (29):
1

where does the rubrospinal tract start

red bodies of midbrain

2

where in the spinal cord does the rubrospinal tract synapse

lateral aspect of the ventral horn

3

where does the vestibulospinal tract start

vestibular nuclei in medulla

4

where does reticulospinal tract start

reticular formation in medulla

5

function of rubrospinal tract

involuntarily flexes UE and extends LE when lat corticospinal tract doesnt work

6

function of medial vestibulospinal tract

automatic positioning of the head with changes in posture with respect to gravity

7

function of lateral vestibulospinal tract

automatic changes in body required to keep balance

8

function of reticulospinal tract

automatic changes in posture with gait movements

9

decorticate posturing

flexion of UE and ext of LE

10

which pathway facilitates decorticate posturing

rubrospinal tract

11

what are the three voluntary motor pathways

lateral corticospinal tract
anterior corticospinal tract
corticobulbar tract

12

is MS a disorder of the UMN or LMN

UMN

13

is Lou Gehrig's disease a disorder of the UMN or LMN

LMN

14

atrophy

shrinkage of muscle due to loss of LMN innervation

15

fasciculation

involuntary muscle contractions (twitches) that are visible, but not strong enough to move a joint

16

what causes fasciculations

damage to LMN
muscle membrane becomes irritable and action potentials occur at random

17

damage to LMN leads to (increase/decrease) in muscle stretch reflex

decrease

18

damage to UMN leads to (increase/decrease) in muscle stretch reflex

increased

19

why is muscle stretch reflex increased with damage to UMN

less UMN inhibition to LMN, therefore LMN closer to threashold

20

positive Babinski's sign

toes fan out when bottom of foot is scratched

21

what does a positive Babinski's sign indicate

UMN problem

22

what is tone

resistance felt by an examiner when she moves a patient's limb through its ROM

23

how is tone determined in body

-balance between excitatory and inhibitory stim to LMN
-state of muscle spindle

24

how is tone measured

examiner initiates an action potential in Ia neuron by passively stretching muscle
-tone is the resistance felt by examiner

25

tone is (increased/decreased) with UMN problems

increased

26

tone is (increased/decreased) in LMN problems

decreased

27

spasticity

weakness with increased tone and increased muscle stretch reflexe
positive Babinski's sign

28

spasticity is a result of (UMN/LMN) injury

UMN

29

amyotropic lateral sclerosis

destruction of LMN & UMN