A small projection or ridge on a bone, specifically a bony prominence found near the trochlea of the humerus (upper arm bone).
From Greek 'epi-' (upon) and 'trochlea,' which comes from 'trochos' (wheel), describing a pulley-like structure. The term describes something resting upon or near this pulley-shaped bone feature.
Your elbow is basically a pulley system—the epitrochlea is a tiny bump above where your elbow bends that helps tendons stay in place and move smoothly, kind of like a guide rail on a machine.
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