Which statement best describes the normal sagittal plane curvatures of the adult spine by region?

• A. Cervical and lumbar regions develop lordosis; thoracic and sacral regions are kyphotic.
• B. All regions are lordotic.
• C. Cervical, thoracic, and lumbar regions are lordotic; sacral is kyphotic.
• D. Cervical and thoracic regions are kyphotic; lumbar and sacral are lordotic.

Answer: (A)