LumbarJAMA Of, relating t,o or constituting the loins or the vertebrae between the thoracic vertebrae and the region of the sacrum. The sacrum is the triangular bone made up of five fused vertebrae that forms the posterior section of the pelvis. The thorax is the part of the human body between the neck and the diaphragm, partially encased by the ribs and containing the heart and lungs; that is, the chest.
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