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Humerus
Bone of the upper arm, longest, heaviest bone of the upper limb, 13 in. long or half again the height of the skull, consists of narrow shaft enlarged at each articular end
Proximal end of the humerus
Composed of head and tubercles
Head of the humerus
Smooth, half-sphere looking somewhat backward to articulate with the should blade (ball-and-socket joint)
Major and minor tubercles of the humerus
Flank the head in front
Intertubercular groove
Separates the major and minor tubercles
Shaft of the humerus
Suggests and S-curve - especially in its lower half which arches backward
Deltoid tuberosity
Midway down the shaft (attachment for the deltoid muscle)
Distal end of the humerus
Broad plate, modified so as to articulate in a special way with each of the forearm bones, most directly associated with the ulna (inner arm bone)
Trochlea
Oblique spool on which the ulna swings up and down (hinge joint)
Capitulum
Provides articulation for the radius (outer forearm bone), ball-shaped surface upon which the indented head of the radius may glade and revolve (converse ball-and-socket joint)
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