The Dorsal Column - Medial Lemniscal (DC-ML) System and its Trigeminal Analogues
The DC-ML system and its Trigeminal (cranial nerve V) analogues account for the discriminative somatic sensibility of the body and head. Discriminative somesthesia implies the capacity to accurately identify the quality (type), amplitude, place, and pattern of a stimulus. Capabilites provided by this system include fine touch (as in tactile two-point discrimination), vibration sensibility, and limb position sense (also called proprioception). Fine touch includes stereognosis, the ability to identify objects by touch without the aid of vision, as well as graphesthesia, the ability to identify, using touch alone, a letter or number traced on the skin.