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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


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


Motor Unit


Motor Unit


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)


Motor Unit


Motor Unit


Muscle Recruitment

  • Training

  • In the lab!


Motor Unit

Stim

Freq

Large Motor Unit,

Brief Contraction

Time

Small Motor Unit,

Long Contraction

Time


Neuromuscular Junction


Muscle Sensors

  • Allow for fine control and adjustments of muscle movements.

  • Protect musculoskeletal system from injury.


Fine Control of Motor Movements


Muscle Spindle


Golgi Tendon Organ


Chemical Feedback

Control of Breathing


“Muscle Memory”


“Muscle Memory”


“Muscle Memory”


“Muscle Memory” is a form of Neural Memory


Spinal Cord Autonomy


Nerve determines Muscle Characteristics


Nerve determines Muscle Characteristics

S

F

S

F

Sc

Fc

mitochondrial  -glycerolphosphate-dehydrogenase


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


Training the Motor Unit?


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