NYCC Neuro I Practice Test

The medial lemniscus pathway is responsible for high-fidelity somatosensory information, specifically discriminatory touch and proprioception. Receptors from the body travel up the dorsal columns to the medulla, where they synapse and cross, then ascend as the medial lemniscus to the thalamus and onward to the somatosensory cortex. This circuit provides precise localization, two-point discrimination, vibration sense, and sense of limb position.

Crude touch, pain, and temperature are carried by other pathways—the anterior and lateral spinothalamic tracts—so they are not primarily transmitted by the medial lemniscus.