Transcript Neuromuscular Control of Movement

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
QuickTime™ and a
decompressor
are needed to see this picture.
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
Soleus by Soleus Nerve
S
F
Sc
FDL by Soleus Nerve
FDL by FDL Nerve
mitochondrial  -glycerolphosphate-dehydrogenase
Fc
Training the Motor Unit?