<prompt> Which of the following is not involved in Wernickes Korsakoff psychosisMamillary bodyThalamusPeriventricular Grey matterHippocampus  <response>: Harrisons principles of internal medicine 17th edition. Pathology: preventricular lesions surround the 3rd ventricles,aqueduct and 4th ventricle; atrophy of mammillary bodies;amnestic defect is related to lesions in dorsal medial nuclei of thalamus. 