The thoracic and lumbar regions define which division of the autonomic nervous system?

The thoracic and lumbar regions define which division of the autonomic nervous system?

• A. Cervical and Thoracic
• B. Thoracic and Lumbar
• C. Lumbar and Sacral
• D. Cervical and Lumbar

Answer: (B)

The thoracic and lumbar regions define the sympathetic division. This division has its preganglionic neurons in the T1–L2 segments of the spinal cord, forming the thoracolumbar outflow. From there, postganglionic fibers reach various organs to prepare the body for rapid, coordinated responses to stress. In contrast, the parasympathetic division originates from the brainstem and the sacral spinal cord (craniosacral outflow) and generally produces more localized, calming effects. So, these thoracic and lumbar regions specifically point to the sympathetic division.

The thoracic and lumbar regions define the sympathetic division. This division has its preganglionic neurons in the T1–L2 segments of the spinal cord, forming the thoracolumbar outflow. From there, postganglionic fibers reach various organs to prepare the body for rapid, coordinated responses to stress. In contrast, the parasympathetic division originates from the brainstem and the sacral spinal cord (craniosacral outflow) and generally produces more localized, calming effects. So, these thoracic and lumbar regions specifically point to the sympathetic division.