Relating to the ribs and the upper or superior part of an anatomical structure; used to describe location in medical anatomy.
From Latin costae 'ribs' plus superior 'upper.' A directional anatomical term combining the location of the ribs with reference to structures above them.
Medical anatomists love these compound directional words because a surgeon saying 'costosuperior' communicates exactly where to look—it's much faster and more precise than explaining 'the upper part near the ribs.'
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