Which describes the ascending pain pathway?

• A. Pain signals travel from the body through the spinal cord to the brain.
• B. Brain sends signals down the spinal cord to reduce pain.
• C. Pain signals originate in the brain and go to the body.
• D. Pain signals do not involve the spinal cord.

Answer: (A)

The key idea is that the ascending pain pathway carries nociceptive signals from the body up to the brain. Nociceptors in the body detect tissue damage and send signals into the spinal cord, where they typically cross to the opposite side and then travel upward through the spinothalamic tract to the thalamus and onward to the cortex. This pathway underlies the perception of pain—the location, intensity, and quality you feel.

In contrast, statements that describe signals traveling from the brain down the spinal cord to reduce pain refer to descending modulatory pathways that can dampen or amplify pain rather than convey the initial pain sensation. The notion that pain signals originate in the brain or that they don’t involve the spinal cord conflicts with the fundamental route by which most pain is transmitted to conscious awareness.