Crossword Genius

It runs up the arm (4)

Ross

I believe the answer is:

ulna

(Other definitions for ulna that I've seen before include "Inner bone of the human forearm" , "part of anatomy" , "Thinner of two long bones in forearm" , "Part of bone-structure" , "Bone from the human elbow" .)

I've seen this clue in The New York Times.
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