Heart pain is segmentally innervated by which spinal levels?

Heart pain is segmentally innervated by which spinal levels?

• A. T2-T6
• B. T1-T5
• C. T6-T12
• D. C7-T1

Answer: (B)

Pain from the heart travels with sympathetic fibers that enter the spinal cord at the upper thoracic levels, primarily T1 through T5. Because visceral pain is referred to the dermatomes served by the same spinal segments, cardiac pain is often felt in the chest and along the areas supplied by these upper thoracic nerves, such as the left chest and arm region. This wiring also helps explain why angina commonly presents as chest discomfort with radiation to the left arm or sometimes the jaw. Other spinal regions (like lower thoracic or cervical) don’t align with the heart’s sympathetic afferents, which is why they’re not the usual sources of cardiac referred pain. Variations can exist, but T1–T5 is the classic pattern for cardiac pain.

Pain from the heart travels with sympathetic fibers that enter the spinal cord at the upper thoracic levels, primarily T1 through T5. Because visceral pain is referred to the dermatomes served by the same spinal segments, cardiac pain is often felt in the chest and along the areas supplied by these upper thoracic nerves, such as the left chest and arm region. This wiring also helps explain why angina commonly presents as chest discomfort with radiation to the left arm or sometimes the jaw. Other spinal regions (like lower thoracic or cervical) don’t align with the heart’s sympathetic afferents, which is why they’re not the usual sources of cardiac referred pain. Variations can exist, but T1–T5 is the classic pattern for cardiac pain.