Title: NRSC 407
1NRSC 407 11/20/07 Motor Control General
Concepts Motor Unit Size Principle Spinal
Reflexes Central Pattern Generators
2Fig 33-1
3Fig 33-2
4Fig 33-3
5Fig. 22.19
6Fig 33-8
7Fig 33-10
What happens when you can see your hand?
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10Fig 34-1
The Motor Unit
11Fig 34-2
12Fig 34-3
13Fig 34-4
14Fig 34-5
15Fig 34-8
16Fig 34-9
17How does the motor system cause increasing
tension?
18Fig 34-10
19Fig 34-11
2022-4
21Fig 34-12
22In-Class Excercise
Intracellular current injection cat spinal motor
neuron
Schwindt and Crill, In Handbook of the Spinal
Cord, 1984
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24Motor Unit 1 a motorneuron all the muscle
fibers it innervates
Motor Units have different sizes and different
properties
Small Slow fatigue resistant Units
Large Fast fatigable Units
Intermediate Fast fatigue resistant
Force is generated by increasing frequency of
twitch And recruitment of larger motor units.
25Muscle Receptors Proprioception
Muscle Spindles Measure Stretch Golgi Tendon
Measures Tension
26Types of Motion Reflex.
Little or no Cortical Input but very fast.
Muscles can only PULL
Extensor Muscles open the joints. Flexor muscles
close or flex the joints.
272
28Fig 36-2
29Fig 36-3
30Gamma Motor Neurons
Fig 36-9
31Fig 36-4
32Fig 36-5
33Fig 36-6
342
35Rhythmic Movement
3622-12
3722-12
3822-11
3922-11
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41Fig 37-1
42Fig 37-2
43Fig 37-3
44Fig 37-7