Lecture 4: Coordination and Vestibular System Flashcards Preview

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Flashcards in Lecture 4: Coordination and Vestibular System Deck (50)
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1

What is main function of cerebellum?

coordinates and regulates posture, movement and balance

2

What is main function of brainstem?

integrates and sorts sensory information

3

What is sequence to perform coordinated movement or balance?

1. sensory input (vestib, visual, proprio)
2. integration of input (brainstem, cerebellum)
3. motor output
4. balance

4

What is coordination?

smooth, accurate and controlled movement which involves sequence, timing and force production

5

What does normal coordination look like?

promixal fixation for distal control, postural control, easy and and off and fluid

6

What is intralimb coordination?

occuring with one limb

7

What is interlimb coordination?

integrated performance of two or more limbs

8

What is visual motor coordination?

ability to integrate both visual and motor abilities

aka hand eye coordination

9

What are key brain structures used for coordination?

motor cortex, descending motor tracts, basal ganglia, cerebellum

10

What does motor cortex and descending pyramidal pathways do?

for trunk and proximal control, anticipatory control, initiation

11

What does basal ganglia do?

regulate initiation and gross intentional movements

regulate complex planning and execution

12

How much of CNS neurons does cerebellum contain?

50 %

13

What cerebellar nuceli are responsible for motor execution?

fastigal and interposed

14

What cerebellar nuclei are responsible for motor planning?

denate

15

What cerebellar nuclei are responsible for balance and eye movements?

vestibular nuclei

16

What is the vermis for?

postural control

17

What are main cerebellar functions?

coordinate range, velocity and strength of muscle contractions to produce steady volitional movements

18

What are other cerebellar functions?

equilibrium, muscle tone regulation, eye head coordination, coordination for muscle of speech

comparator- corrects errors of movement
comensator

19

What type of system is cerebellar functions?

closed loop

20

What is ataxia?

cerebellar pathology that results in disordered movement, difficulty initiating volitional movement

errors in rate, rhytym and timing of muscle

21

What side does ataxia occur on?

ipsilateral side of lesion

22

What is etiology of ataxia?

congenital, acquired (strokes, tumors, trauma)

23

What is most common sign of cerebellar lesion?

ataxic gait, decreased arm swing, uneven step length, increased BOS, high movement variability

24

What is dysdiadochokinesia?

decreased rapid alternating movements, antagonistic muscle firing over powers agonist

flipping hand back and forth

25

What is dysmetria?

deficit in reaching a target, overshooting a target when pointing

26

What is dyssynergia?

breaking down movement into unsmooth motion

27

What is an intention tremor?

oscillation of limb with volitional movement, most pronounced with end of movement

28

What is role of vestibular system?

critical in control of posture, where are we in relation to gravity, proprioception, sensing and perceiving motion, gaze stability

29

What are two components of peripheral apparatus?

bony labrinth and membranous labyrinth

30

What makes up the bony labyrinth?

1. three semi circular canals
2. cochlea
3. vestibule