Motor Systems/LMNs
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What structure is said to be involved in "gating of volitional movements?" | show 🗑
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| What is the relation of flexor to extensor motoneuron pools? | show 🗑
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| show | proximal muscles are medial to distal muscles within ventral horn
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| show | low (10 fibers per unit)
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| show | high (1000 fibers per unit)
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| show | gamma motoneurons
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| How much synaptic current is required to intiate repetitive firing of a motoneuron? | show 🗑
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| show | fast fatigable
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| show | persistent changes in motor neuron activity can over time induce changes in muscle fiber type
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| show | increase the firing rate of active units and recruit more units
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| show |
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| Which type of muscle's nerve fibers will have the lowest threshold? | show 🗑
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| show | lower freq
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| show | Small motoneurons have a larger input resistance and thus a smaller current can is needed to successfully initiate a depolarization. Large motoneurons require more current to depolarize due to their small effective resistance
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| show | focal atrophy or diffuse muscle wasting, fasciculations, muscle weakness, decreased DTRs
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sirprakes
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