What makes up the dorsal column-medial lemniscal pathway?

• A. Cuneate fascicles and Fasciculus gracilis
• B. Spinothalamic tracts only
• C. Lateral corticospinal tracts
• D. Fasciculus cuneatus only

Answer: (A)

The dorsal column-medial lemniscal pathway is formed by two dorsal column tracts: the fasciculus gracilis and the fasciculus cuneatus. They carry fine touch, vibration, and proprioception from the body, with the gracilis handling input from the lower body and the cuneatus from the upper body. These tracts ascend ipsilaterally to the medulla, where they synapse in the nucleus gracilis and nucleus cuneatus and then cross to form the medial lemniscus on the way to the thalamus. The other options point to different pathways: the spinothalamic tracts deal with pain and temperature, the lateral corticospinal tracts are motor, and the fasciculus cuneatus alone would exclude input from the lower body.