Clavicle:
It receives its name from the Latin clavicula (“little key”),not because of its long key shape but because the bone rotates along its axis like a key when the shoulder is abducted.
During arm abduction, the
scapular motion relative to the clavicle showed 15.6° protraction, 21.5° upward rotation, and 22.2° posterior tilting.
Courtesy
