Extrapyramidal tracts are those motor tracts that do not traverse the medullary pyramids.
2.
The midbrain nuclei include four motor tracts that send upper motor neuronal axons down the spinal cord to lower motor neurons.
3.
Since the ventral and dorsal spinal cord have separate blood supply with very limited collateral flow, an anterior cord syndrome ( paralysis or paresis with some preserved sensory function ) is a possible surgical sequela, so it is important to have monitoring specific to the motor tracts as well as dorsal column monitoring.
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