H.M. Brain Prep (image) University of California - San Diego Share Print E-Mail Caption Jacopo Annese prepares H.M.'s brain, preserved in gelatin, for freezing and subsequent cutting into 2,401 thin tissue slices. Credit UC San Diego School of Medicine Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.