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11 Cards in this Set
- Front
- Back
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What is a motor unit?
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Single motoneuron and the muscle fibers it innervates
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What is a small motoneuron?
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Motoneuron that innervates only a few muscle fibers
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What is a large motoneuron?
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Motoneuron that innervates many muscle fibers
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What is a motoneuron pool?
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Collection of motoneurons that innervate the muscvle fibers of the same muscle
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How is muscle contraction increased?
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By recruitment of additional motor units
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What is the size principle?
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As motor units are recruited, more motor neurons become involved, which generate more tension.
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What type of muscle sensors are there and what do they detect?
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1. Muscle spindles: detect changes in muscle length(dynamic and static)
2. Golgi tendon organs: detect muscle tension 3. Pacinian corpuscles: detect vibration 4. Free nerve endings: detect noxious stimuli |
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What type of muscle fibers are there?
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Extrafusal and intrafusal
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What type generates the force for contraction?
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Extrafusal fibers
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What are the innervations for extrafusal fibers and intrafusal fibers?
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Extra- alpha motoneurons
Intra- gamma motoneurons |
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How are intrafusal fibers arranged in relation to extrafusal?
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They run in parallel, but not for the entire length of the muscle
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