Two point threshold test, tests the integrity of:: (A) Anterior spinothalamic tract, (B) Lateral coicospinal tract, (C) Lateral spinothalamic tract, (D) Dorsal column
Answer is D. Dorsal column (medial lemniscal system): Fibres mediating fine touch, fine pressure, two point discrimination, proprioception, joint position sense and vibration ascends in the dorsal column. Ref: Ganong's Review of medical physiology, 22 Edition, Page 138.