Fig. 39-1. The primary (1, thoracic; 2, sacral) and secondary (3, cervical; 4, lumbar) curvatures of the vertebral column. Click for high resolution image.
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Fig. 39-1. The primary (1, thoracic; 2, sacral) and secondary (3, cervical; 4, lumbar) curvatures of the vertebral column. Click for high resolution image.