The proximal end of the humerus begins with the head, which expands in all directions from the slimmer anatomical neck. On one side of the bone is the greater tubercle, a bony projection for muscle attachment. The lesser tubercle is smaller and sits closer to the center of the humerus. Between the two tubercles is the deep groove of the intertubercular sulcus. The surgical neck of the humerus lies just underneath the tubercles.
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