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pyramidal vs. extrapyramidal

pyramidal

[ pi-ram-i-dl ]
adjective
  1. of, relating to, or shaped like a pyramid: the pyramidal form.
  2. of the nature of a pyramid; pyramidlike.

extrapyramidal

[ ek-struh-pi-ram-i-dl ]
adjective
  1. pertaining to or involving nerve tracts other than the pyramidal tracts, especially the corpus striatum and its associated structures.
  2. located outside the pyramidal tracts.