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What is paraplegia in flexion and extension?

Asked by Mani Gautam 

Paraplegia in extension indicates an increase in the extensor muscle tone owing to the overactivity of gamma efferent nerve fibers to muscle spindles as the result of the release of these neurons from the higher centers. Also, extrapyramidal descending tracts (vestibulospinal and rubrospinal tracts) may escape injury in incomplete spinal cord injury leading to increased activity in extensor motor neurons. Paraplegia in extension may convert to paraplegia in flexion if the damage to the spinal cord increases