The sympathetic supply to the head originates from which spinal levels?

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Multiple Choice

The sympathetic supply to the head originates from which spinal levels?

Explanation:
Sympathetic input to the head comes from the upper thoracic spinal cord. Preganglionic neurons reside in the intermediolateral cell column at T1 and T2, their fibers exit the cord and ascend in the sympathetic chain to synapse in the superior cervical ganglion. Postganglionic fibers then hitch a ride with the internal carotid artery (forming the internal carotid plexus) to reach structures in the head. Because the head’s preganglionic supply is from these upper thoracic levels, T1 and T2 are the correct sources. Lower thoracic levels do not contribute preganglionic fibers to the head.

Sympathetic input to the head comes from the upper thoracic spinal cord. Preganglionic neurons reside in the intermediolateral cell column at T1 and T2, their fibers exit the cord and ascend in the sympathetic chain to synapse in the superior cervical ganglion. Postganglionic fibers then hitch a ride with the internal carotid artery (forming the internal carotid plexus) to reach structures in the head. Because the head’s preganglionic supply is from these upper thoracic levels, T1 and T2 are the correct sources. Lower thoracic levels do not contribute preganglionic fibers to the head.

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