<prompt> After an accident, a patient lost the position and vibration sense from his lower half of the body. It is seen in the lesion of:Anterior columnDorsal columnSpinothalamic tractAll of the above  <response>: Dorsal column tracts are pa of the medial lemniscal system, convey well-localized sensations of fine touch, vibration, two-point discrimination, and proprioception position sense from the skin and joints; they ascend, without crossing, in the dorsal white column of the spinal cord to the lower brain stem. Ref: Waxman S.G. 2010. Chapter 5. The Spinal Cord. In S.G. Waxman Ed, Clinical Neuroanatomy, 26e. 