What is the function of the Anterolateral pathway?

• A. Fine touch and proprioception
• B. Crude touch, pain, temperature, tickle, itch
• C. Hearing
• D. Vision

Answer: (B)

The Anterolateral pathway carries pain, temperature, and crude touch from the body, including related sensations such as itch and tickle. It starts with pain and temperature receptors in the skin, whose fibers enter the spinal cord and synapse in the dorsal horn. These fibers cross to the opposite side relatively soon (decussate) and then ascend in the anterior and lateral columns to the thalamus, with most signals finally reaching the somatosensory cortex. Because this pathway is designed for less precise localization, it conveys these diffuse, poorly localized sensations rather than fine touch or proprioception. That’s why it’s not responsible for discriminative touch, vibration, or position, nor for hearing or vision, which use entirely different pathways.