Which pathway conveys pain and temperature signals from the body to the brain?

Which pathway conveys pain and temperature signals from the body to the brain?

• A. Spinothalamic tract
• B. Dorsal column-medial lemniscus pathway
• C. Corticospinal tract
• D. Spinocerebellar tract

Answer: (A)

Pain and temperature signals travel through the spinothalamic tract, part of the anterolateral system. Nociceptive and thermoreceptive fibers enter the spinal cord, synapse in the dorsal horn, cross to the opposite side near the level of entry, and then ascend in the lateral spinothalamic tract to the thalamus, with projections to the somatosensory cortex for conscious perception. This pathway is specialized for conveying crude, quickly arriving pain and temperature information, distinguishing it from other modalities. For example, the dorsal column-medial lemniscus pathway handles discriminative touch, vibration, and proprioception; the corticospinal tract is the major motor pathway; and the spinocerebellar tracts carry unconscious proprioception to the cerebellum.

Pain and temperature signals travel through the spinothalamic tract, part of the anterolateral system. Nociceptive and thermoreceptive fibers enter the spinal cord, synapse in the dorsal horn, cross to the opposite side near the level of entry, and then ascend in the lateral spinothalamic tract to the thalamus, with projections to the somatosensory cortex for conscious perception. This pathway is specialized for conveying crude, quickly arriving pain and temperature information, distinguishing it from other modalities. For example, the dorsal column-medial lemniscus pathway handles discriminative touch, vibration, and proprioception; the corticospinal tract is the major motor pathway; and the spinocerebellar tracts carry unconscious proprioception to the cerebellum.