Relating to or located near an epapophysis, a small bony projection on vertebrae.
From epi- (upon) + apophysis (outgrowth) + -ial (relating to). Medical/anatomical term describing features of bone structures.
Your spine is covered with tiny bony bumps and projections—epapophysial structures are among the smallest ones, and they're perfect landmarks that surgeons use to identify exactly which vertebra they're operating on.
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