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ruzuzu commented on the word counternutation
"Nutation and counternutation refer to movement of the sacrum defined by the rotation of the promontory downwards and anteriorly, as with lumbar extension (nutation); or upwards and posteriorly, as with lumbar flexion (counternutation)."
-- https://en.wikipedia.org/w/index.php?title=Anatomical_terms_of_motion&oldid=778251662
August 9, 2017