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Summary
N243 Spinal Cord Injury
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---8March 20252024/2025A+
- SEE CHARTS BELOW 
 
Nervous System Review 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
•	Ascending Tracts (Sensory) 
o	Carry sensory information from receptors in the skin, muscle, joints, viscera, and blood vessels to higher levels of the CNS 
•	Descending Tracts (Motor) 
o	Carry signals that are responsible for voluntary muscle movement 
o	Upper motor neurons (UMN) 
▪	Begin in the cerebral cortex and project downward 
o	Lower motor neurons (LMN) 
▪	Influence skeletal muscles of the arms, trunk, and le...
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