decussation of the pyramids
noun
variants
or decussation of pyramids
anatomy
: pyramidal decussation
An acute right-sided corticospinal system lesion above the decussation of the pyramids or a left-sided lesion below the decussation but above the seventh dorsal cord segment will abolish the left abdominal reflexes.—Robert T. Ross, How to Examine the Nervous System, 2006
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Merriam-Webster unabridged
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