Watch HM's brain being documented, slice by slice.
Click here for live link. At the time of this posting, they are already at the occipital structures. So they may finish soon. Not sure what will happen to the link or the video once this entire process is done.
HM was a famous epileptic patient who had much of his medial temporal structures removed as a treatment for the epilepsy. The result of this operation rendered HM unable to form new long-term memories. This finding was instrumental in the notion that the medial temporal structures, such as the hippocampus, is important for memory. Since his operation, HM has been heavily studied. HM passed away on the 8 Dec 2008 due to respiratory failure. [More about HM]