Which pathway is responsible for fine touch and proprioception from the body?

• A. Dorsal column–medial lemniscus pathway
• B. Anterolateral system
• C. Corticospinal tract
• D. Spinocerebellar tract

Answer: (A)

Fine touch and proprioception from the body are carried by the dorsal column–medial lemniscus pathway. This system carries discriminative touch, vibration, and precise position sense by traveling up the dorsal columns—gracile fibers from the lower body and cuneate fibers from the upper body—on the same side to the medulla. There, second-order neurons cross and form the medial lemniscus, which ascends to the thalamus (ventral posterolateral nucleus) and then to the somatosensory cortex. This pathway explains why these sensations are felt with detail and accuracy. The other options serve different roles: the anterolateral system handles crude touch, pain, and temperature; the corticospinal tract is motor; and the spinocerebellar tracts convey proprioception for coordination to the cerebellum, mostly without conscious perception.