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20 Cards in this Set

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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
cranial nerves for motor
hypoglossal(tongue)
facial muscles
trigeminal(face senses and chewing)
extra oculoary muscles
T/F
muscles pull on a joint, they can't push
T
Axial muscles (somatic muscles)
movement of trunk
found throughout the length of spinal cord
Proximal muscles (somatic muscles)
move shoulder, elbow, pelvis, knee
-critical for locomotion
neurons found in nearest cervical(arm) and lumbosacral(leg) enlargements
Distal muscles (somatic muscles)
move hands, feet, digits for manipulation of objects

neurons found in nearest cervical(arm) and lumbosacral(leg) enlargements
Lower motor neurons
final common pathway for movement.
-motor neurons directly inervate skeletal muscles
-found in ventral horn->ventral root->spinal nerve efferent
Spatial distribution of lower motor neurons

medial-lateral rule
dorsal-ventral rule
medial-lateral
axial-medial
distal-lateral

dorsal-ventral
flexor-dorsal
extensors-ventral
T/F
Each muscle fiber is innervated by 1 axon
from motor neuron
T
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)
Motor neuron pool
all alpha motor neurons that innervate one muscle
-synergistic motor units make up a motor neuron pool
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