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20 Cards in this Set
- Front
- Back
T/F
motor system control skeletal muscle activity(behavior) and vegetative functions of the body through the somatic motor system and autonomic nervous system. Together these functions are known as EFFERENT activity |
T
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3 types of muscles
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striated
cardiac(heart muscle) smooth(autonomic NS) |
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3 classes of movements
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1.simple reflex(hand on hot stove)
2.coordinated more complex reflex (walking, rhythmic patterns not controlled)require more than one kind of muscle 3.Voluntary, skilled mov (driving, pitching a ball, speech) |
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hierarchical system
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spinal cord
brainstem motor cortex basal ganglia cerebellum |
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cell bodies for motor neurons located in
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ventral horn, also found in brainstem regions for cranial nerves that control motor
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cranial nerves for motor
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hypoglossal(tongue)
facial muscles trigeminal(face senses and chewing) extra oculoary muscles |
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T/F
muscles pull on a joint, they can't push |
T
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Axial muscles (somatic muscles)
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movement of trunk
found throughout the length of spinal cord |
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Proximal muscles (somatic muscles)
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move shoulder, elbow, pelvis, knee
-critical for locomotion neurons found in nearest cervical(arm) and lumbosacral(leg) enlargements |
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Distal muscles (somatic muscles)
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move hands, feet, digits for manipulation of objects
neurons found in nearest cervical(arm) and lumbosacral(leg) enlargements |
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Lower motor neurons
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final common pathway for movement.
-motor neurons directly inervate skeletal muscles -found in ventral horn->ventral root->spinal nerve efferent |
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Spatial distribution of lower motor neurons
medial-lateral rule dorsal-ventral rule |
medial-lateral
axial-medial distal-lateral dorsal-ventral flexor-dorsal extensors-ventral |
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T/F
Each muscle fiber is innervated by 1 axon from motor neuron |
T
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Motor unit
small large |
alpha motor neurons and all muscle fibers it innervates
-many motor units necessary to contract entire muscle small-smaller muscles that control mov of fingers and rotation of the eyes(3 muscles per motor neuron) Large-more force during contraction (1000:1) |
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Motor neuron pool
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all alpha motor neurons that innervate one muscle
-synergistic motor units make up a motor neuron pool |
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T/F
motor system control skeletal muscle activity(behavior) and vegetative functions of the body through the somatic motor system and autonomic nervous system. Together these functions are known as EFFERENT activity |
T
|
|
3 types of muscles
|
striated
cardiac(heart muscle) smooth(autonomic NS) |
|
3 classes of movements
|
1.simple reflex(hand on hot stove)
2.coordinated more complex reflex (walking, rhythmic patterns not controlled)require more than one kind of muscle 3.Voluntary, skilled mov (driving, pitching a ball, speech) |
|
hierarchical system
|
spinal cord
brainstem motor cortex basal ganglia cerebellum |
|
cell bodies for motor neurons located in
|
ventral horn, also found in brainstem regions for cranial nerves that control motor
|