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Neuromuscular Control of Movement. Organization of Brain Motor Centers. The -Motor Neuron. Innervates skeletal muscle Receives input from higher centers Receives sensory input from muscle stretch and tension receptors. Motor Unit. The -Motor Neuron. All or none Size principle.

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Neuromuscular Control of Movement

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Neuromuscular control of movement l.jpg

Neuromuscular Control of Movement


Organization of brain motor centers l.jpg

Organization of Brain Motor Centers


The motor neuron l.jpg

The -Motor Neuron

  • Innervates skeletal muscle

  • Receives input from higher centers

  • Receives sensory input from muscle stretch and tension receptors


Motor unit l.jpg

Motor Unit


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The -Motor Neuron

  • All or none

  • Size principle


Motor unit6 l.jpg

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 Unit

Stim

Freq

Large Motor Unit,

Brief Contraction

Time

Small Motor Unit,

Long Contraction

Time


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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


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Nerve determines Muscle Characteristics


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Nerve determines Muscle Characteristics

S

F

S

F

Sc

Fc

mitochondrial  -glycerolphosphate-dehydrogenase


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Nerve determines Muscle Characteristics

Stimulation Frequency

Soleus by FDL Nerve

S

F

S

F

Soleus by Soleus Nerve

Sc

Fc

FDL by Soleus Nerve

FDL by FDL Nerve

mitochondrial  -glycerolphosphate-dehydrogenase


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Training the Motor Unit?


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