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Also, note that the spinal cord is shorter than the vertebral column so that the spinal nerve roots extend cau- dally when leaving the spinal cord.
In distinguishing a spinal nerve root lesion from a more peripheral nerve lesion, several points should be considered.
Severing a single spinal nerve root commonly results in little if any motor or sensory defect owing to the overlap distribution of adjacent roots.
With certain exceptions the dermatome (skin) map of the various spinal nerve roots approximately overlies the muscular map distribution of the same spinal cord segments.
Spinal nerve root lesions result in deficits that differ from those that follow lesions of peripheral nerve plexuses and more peripheral extensions of the nerve.
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