<prompt> Ablation of the somatosensory area I of the cerebral coex leads to :Total loss of pain sensationTotal loss of touch sensationLoss of tactile localization but not of two point discriminationLoss of tactile localization and two point discrimination  <response>: D i.e. Loss of tactile localization two point discrimination Functions Lesions Somatosensory area I SI Primary somatosensory area SI is Brodmanns area 1, 2, 3 situated in postcentral gyrus. Ablation of SI would lead to coical pattern of sensory loss. Lesion in this area produce contralateral impairment of: - TouchQ - Sterognosis - Pressure - Barognosis - Proprioception - Cutaneographia - Two point discrimationQ Spinal cord lesion Brainstem lesion Thalamic lesion Coical lesion Five patterns are seen depending Loss of pain temperature Hemisensory loss of Patients is able to recognize all upon whether there is: on ipsitateral face and all modalitiesQ sensation but localizes them - Complete transaction opposite side of bodyQ. poorly - Hemisection Lateral medullary - Loss of two point - Central cord section syndromeQ discriminationQ - Posterior column section sensation - Sensory inattention 