1. Relating to the thoracic and lumbar portions of the vertebral column. 2. Relating to the origins of the sympathetic division of the autonomic nervous system. See autonomic division of nervous system.
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tho·ra·co·lum·bar -'ləm-bər, -.bär adj
1) of, relating to, arising in, or involving the thoracic and lumbar regions
2) SYMPATHETIC (1) <\thoracolumbar nerve fibers>
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tho·ra·co·lum·bar (thor″ə-ko-lumґbər) (-bahr) pertaining to the thoracic and lumbar parts of the spine.Medical dictionary. 2011.