Nervous System Injuries:
In this course we pose many nerve lesion or injury questions in order to test understanding of nerve innervation and pathways. Injuries to the nervous system are common and may occur through disease processes or trauma (crushing or cutting). The effect of the power of the body to repair or compensate for the disease or injury depends upon the site and nature of the injury. Injuries or diseases may destroy neurons or interrupt nerves leading to an identifiable loss of function affecting sensory, motor or integrative functions. Little or no regeneration or repair occurs in the central nervous system, although there may be compensation for some injuries. When a neuron dies it is not replaced. When injured, particularly when cut, peripheral nerves may regenerate by the growing of new axons down the remaining nerve sheath. Regrowth occurs at about 1 mm/day and the amount of functional restoration depends upon how well the cut nerves are reapproximated.
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