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Neuro3 Motor System
Neuro3 Motor System I
| Question | Answer |
|---|---|
| What is the low-level of the Power-Axis, what is it involved in? | VENTRAL HORN. Can modify sensory input by generating simple output (Very Simple withdrawl. **Getting touched by someone and you withdrawl. |
| What are the 3 components of the Power-Axis | 1.Low-level: Ventral Horn. 2.Mid-level: Corticospinal tract & pyramids. 3.High-level: Motor Cortex. |
| What is the function of the Mid-level Power-Axis | Combine multiple low level events to generate a more complicated process. **Walking, chewing, bladder control. |
| What is the function of the High-level Power-Axis | Control the mid-level & low-level processes. **Can be INHIBITORY or EXCITATORY and controls the magnitude/strength at the low-level (lower motor neuron) |
| Describe the low, mid, and high level functions over urination | 1.Low: Evacuation of bladder due to stretch reflex. 2.Mid: controls how much of the bladder is emptied past the threshold of stretch reflex. 3.High: Controls mid & low to ensure bladder evacuation only occurs at appropriate times. |
| Describe the low, mid, and high level functions over walking | 1.Low: generates gait patterns. 2.Mid: Adjusts those patterns to gravity (so you dont fall). 3.High: determines if you want to go L, R, quick, slow... |
| What will the patient present with if they have damaged their Power-Axis? does the location change symptoms? | Loss of Power (WEAKNESS): 1.Low-level (lower motor neuron): hypotonic, hyporeflexive. 2.Mid or High-level: hypertonic, hyperreflexive. |
| What is Velocity dependence in relation to muscle weakness? which type of muscle weakness would you see this? | UPPER MOTOR NEURON LESION would can this: The resistance seen during passive ROM will be dependent on how fast you are passively moving them |
| What is the Timing Processor for the Power-Axis | Cerebellum: Ensures smooth, coordinated movements |
| Would damage to the cerebellum produce muscle weakness? | NO, you would get a MOVEMENT DISORDER. |
| What is the Pattern Processor for the Power-Axis? what is its function? | Basal Ganglia (deep nuclei underneath cerebral cortex): Modifies/filters the patterns leaving the cortex to descend the Power-Axis. |
| Would damage to the Basal Ganglia produce Muscle weakness? | NO, you would get a MOVEMENT DISORDER. |
| List the 2 main types of the Movement disorders and where damage would have to be to cause them | 1.ATAXIA: cerebellum (lack of coordination). 2.DYSKINETIC: Basal Ganglia (affects the amount of patterns muscles recieve). |
| If you lesion the Power-Axis, can you tell if the Cerebellum or Basal ganglia are damaged as well? | NO, b/c you will not have the ability to produce any movement. |
| List 2 diseases resulting from Dyskinesia due to Basal Ganglia damage | 1.Parkinson's (a or brady kinesia): Filter tightens & the person is stuck (makes it hard to initiate movement). 2.Huntington's (Balistic kinesia): Hardly any pattern filtering causing random movement (will stop while sleeping). |
| What are the 3 things you look for to Identify if the Motor system lesion is located in the Power-Axis, the Cerebellum, or the Basal ganglia? | 1.Weakness (power-axis). 2.Ataxia (cerebellum). 3.Dyskinesia (basal ganglia). |
| Describe the 4 main Central Pattern Generators? What patterns are they in control of? | 1.Ventral Horn: Locomotion, protective reflexes. 2.Brainstem: Eye movement, chewing, swallowing, breathing. 3.Hypothalamus: Eating, drinking, Emotional & Goal-directed behavior. 4.Cortex: Fine motor skills, speech, hand-finger control. |
Created by:
WeeG
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