neuromuscular control of movement. organization of brain motor centers
TRANSCRIPT
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Neuromuscular Control of Movement
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Organization of Brain Motor Centers
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The -Motor Neuron
• Innervates skeletal muscle
• Receives input from higher centers
• Receives sensory input from muscle stretch and tension receptors
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Motor Unit
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The -Motor Neuron
• All or none
• Size principle
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Motor Unit
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Motor Unit
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Motor Unit
• The ratio of nerves to muscle fiber is specific to a motor unit and defined by the task.
Fine movements (focusing eyes)
Gross movements (muscles involved in jumping)
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Motor Unit
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Motor Unit
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Muscle Recruitment
• Training
• In the lab!
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Motor UnitLarge Motor Unit, Brief Contraction Time
Small Motor Unit, Long Contraction Time
StimFreq
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Neuromuscular Junction
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Muscle Sensors
• Allow for fine control and adjustments of muscle movements.
• Protect musculoskeletal system from injury.
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Fine Control of Motor Movements
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Muscle Spindle
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Golgi Tendon Organ
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Chemical Feedback
Control of Breathing
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“Muscle Memory”
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“Muscle Memory”
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“Muscle Memory”
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“Muscle Memory” is a form of Neural Memory
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Spinal Cord Autonomy
QuickTime™ and a decompressor
are needed to see this picture.
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Nerve determines Muscle Characteristics
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Nerve determines Muscle Characteristics
S F
Sc
S F
Fc
mitochondrial -glycerolphosphate-dehydrogenase
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Nerve determines Muscle Characteristics
S F
Sc
S F
Fc
mitochondrial -glycerolphosphate-dehydrogenase
Stimulation Frequency
Soleus by Soleus Nerve
FDL by Soleus Nerve
FDL by FDL Nerve
Soleus by FDL Nerve
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Training the Motor Unit?