Three major stages of humerus shape evolution: from the blocky humerus of aquatic fish, to the L-shape humerus of transitional tetrapods, and the twisted humerus of terrestrial tetrapods. Columns ...
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Humerus bone anatomy
The humerus is the only bone in the upper arm. It connects to the shoulder and elbow joint. The humerus works with muscles to raise and rotate the arm. Fracture or dislocation of the humerus can cause ...
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