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15 Cards in this Set
- Front
- Back
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Two major types of neurons are found in ventral horn
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Alpha and gamma
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Alpha motor neurons innervate _
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Extrafusal fibers of skeletal muscles
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Gamma motor neurons innervate _
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Intrafusal fibers of skeletal muscle
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Inhibitory interneurons are in which lamina
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VII
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Small alpha motor neurons innervate what muscles
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Slow twitch fatigue resistant fibers
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Large alpha motor neurons innervate what muscles
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Fast twitch fatigue susceptible
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Major contractile element is _
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Extrafusal fiber
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Muscle spindle is intrafusal/extrafusal
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Intrafusal
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2 types of fibers in muscle spindle
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Nuclear bag and nuclear chain
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Which portion of muscle spindle is non-contractile and is the receptor portion
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CENTRAL
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Primary group Ia fibers innervate _
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bag and chain fibers
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Primary (group Ia) fibers form _ endings
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Annulospiral
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Secondary (group II) fibers form _
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flower spray
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Spindles are aligned _ , receptors are in _
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PARALLEL to extrafusal fibers
SERIES |
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Tension in receptor portion can be increased by contraction of _
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EXTRAFUSAL FIBERS
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