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6 Cards in this Set
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where does the synapse between UMN and LMN take place
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anterior horns of spinal cord (esp. cervical and lumbar)
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Describe the "firing state" of UMNs and LMNs
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LMN-always firing, tonically stimulates the muscle to contract, UMN-inhibits the LMN, allows the muscle to relax
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Describe the UMN pattern of weaness
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Arms-tonically flexed at elbows, wrist, fingers; Legs-tonically extended at the knee, ankle
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what are the possible localizations for a LMN lesion (6)
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1. Anterior horn cell (ALS, spinal muscular atrophy, polio) 2. Root (disc herniation) 3. Plexus 4. Periperipheral nerve 5. neuromuscular junction 6. muscle
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Describe the pattern of wekaness in an ACA vs. MCA stroke
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ACA=leg, MCA=face, arm
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what distribution will the weakness be in an ACA-MCA watershed stroke
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Arm>leg
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