Plural of clavicle; the pair of bones that connect your shoulder blades to your breastbone, commonly called collarbones.
From Latin 'clavicula,' literally 'little key,' because the bone's shape resembles a small key. The Romans noticed this resemblance and named it accordingly, a name that stuck through medical terminology.
Your clavicles are one of the most commonly broken bones in athletic injuries because they're relatively thin and stick out, but breaking them is actually protective—it's a way for your body to absorb impact that might otherwise damage your shoulder joint.
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