decussation of the pyramids

noun
variants: or decussation of pyramids

Definition of decussation of the 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

First Known Use of decussation of the pyramids

1810, in the meaning defined above

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