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11 Cards in this Set
- Front
- Back
Skeletal muscle influenced by CNC |
through two sets of neuron : |
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motor neuron pathways |
Pyramidal Tracts Corticospinal tract |
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Descending corticospinal (pyramidal) motor tracts |
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Upper Motor Neuron Lesions |
- Interruption of the corticospinal and corticonuclear tract along itscourse. - also known as pyramidal insufficiency. |
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Symptoms of UMN Lesions |
- Changes in muscle performance. - These changes vary depending on the site and the extent of the lesion, and may include: - increase deep tendon reflex (DTR) |
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Examples of UMN Lesion |
Cerebrovascular accident |
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lower motor neurons |
- All voluntary movement depend upon excitation of lower motor neuron by upper motor neuron - These are the only neurons that innervate the skeletal muscle fibers, they function as the final common pathway, the final link between the CNS and skeletal muscle
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Lower Motor Neuron Lesion |
It is a lesion which affects nerve fibers traveling from the anterior horn of the spinal cord to the relevant muscle of the lower motor neuron. One major characteristic used to identify a lower motor neuron lesion is flaccid paralysis(reduced/loss muscle tone). |
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Sign of LMN Lesion |
Flaccid paralysis of muscles supplied. Atrophy of muscles supplied. |
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Motor neuron disease Peripheral nerve neuropathy |
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UMN and LMN Lesions |
* Upper motor neuron lesion |