CNS problems can occur within the spinal cord,the brainstem,the cerebellum,and the cerebral cortex.Sensory deficits from spinal cord damage vary with the location of the damage.Involvement of only the posterior column leads to lost proprioception (position sense) below the level of the damage on the same side or on both side (if both the right and left posterior columns are involved).A lesion involving only the right spinothalamic tract results in a loss of pain and temperature sensation below the lesion on the left side . problems in the brainstem , thalamus,and cortex generally result in loss of sensation on the contralateral(opposite)side of the body . Cerebellar lesions affect sensation on the same side of the body.