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17 Cards in this Set
- Front
- Back
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Where do Lower Motor Neurons project to? |
project to skeletal muscles |
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flaccid paralysis |
weakness, reduced muscle tone (lower motor neurons) |
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Where do Upper Motor Neurons project to? |
project to motor neurons in spinal cord/cranial nerve nuclei |
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spastic paralysis |
continuous spasms to muscles |
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where are Upper Motor Neurons found? |
in cortex and brain stem |
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where are Lower Motor Neurons found? |
spinal cord and cranial nerve nuclei |
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when is the primary motor cortex active? |
during voluntary movement; specific/fine motor control |
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when is the premotor cortex active? |
mental rehersal of an action (planning, prep) externally guided movement |
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When is supplementary motor cortex active? |
internally guided movements complex sequences, well learned movements bimanual coordination |
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where does primary sensory cortex project? |
primary motor |
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Where do assoc. areas project? |
premotor & supplementary motor |
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Where do premotor & supplementary motor project? |
primary motor cortex |
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corticobulbar tract |
arises from facial region of precentral gyrus |
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Rubrospinal 1) cells of origin 2) cross midline 3) terminate in? |
1) cells of origin: red nucleus 2) midbrain to form rubrospinal tract 3) terminates in cervical spinal cord |
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Corticospinal 1) cells of origin 2) descends thru what? 3) terminate on ? |
1) cells of origin: pyramidal cells 2) descend ipsilaterally thru: cerebellar peduncle, basilar pons, rostral pyramidal tract in pons 3) terminate on motor neurons or interneurons that project to motor neurons |
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lateral corticospinal tract (%) |
85% cross on contralateral side in pyramidal decussation |
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anterior corticospinal tract (%) |
15% remain ipsilateral |
