Which spinal segments provide the sympathetic nerve supply to the heart?

Explanation

The sympathetic innervation of the heart originates primarily from the spinal segments T1 to T3. These segments send sympathetic fibers that influence heart rate and contractility. Other listed segments, such as T2 to T6 or T3 to T7, do not primarily contribute to cardiac sympathetic innervation, and lumbar segments (L1 to L5) are unrelated to heart innervation.