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Front view of the bones of the thorax, including the ribs, sternum and vertebrae. Labels: 1, first bone of the sternum; 2, second bone of the sternum; 3, third bone or ensiform cartilage; 4, first dorsal vertebra; 5, last or twelfth dorsal vertebra; 6, first rib; 7, its head; 8, its neck; 9, its tubercle; 10, seventh or last true rib; 11, its cartilage; 12, angle of eleventh rib; 13, its body.

The Bones of the Thorax

Front view of the bones of the thorax, including the ribs, sternum and vertebrae. Labels: 1, first bone…