From which spinal levels do the preganglionic neurons of the sympathetic system exit the cord?

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Multiple Choice

From which spinal levels do the preganglionic neurons of the sympathetic system exit the cord?

Explanation:
Sympathetic preganglionic neurons come from the intermediolateral cell column located from T1 to L2 in the spinal cord. They exit through the ventral roots at those levels and enter the sympathetic chain via the white rami communicantes, defining the thoracolumbar outflow. Levels above T1 or below L2 don’t contain these preganglionic cell bodies, and sacral levels (S2–S4) are associated with parasympathetic outflow. So the correct range is T1–L2.

Sympathetic preganglionic neurons come from the intermediolateral cell column located from T1 to L2 in the spinal cord. They exit through the ventral roots at those levels and enter the sympathetic chain via the white rami communicantes, defining the thoracolumbar outflow. Levels above T1 or below L2 don’t contain these preganglionic cell bodies, and sacral levels (S2–S4) are associated with parasympathetic outflow. So the correct range is T1–L2.

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