Post-ganglionic injury: results in Wallerian degeneration of both motor and sensory axons. There is physical separation of the axon from the cell bodies in the DRG and the ventral portion of the spinal cord. CMAP and SNAP responses are diminished or absent. Pre-ganglionic injury: produces the same injury to the motor fi bers but allows the peripheral sensory fi bers to remain in contact with their cell body. SNAPs are normal in this injury.
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