Hi Lisbeth
To answer your query, as lmur suggested I found it in the furthest recesses of my brain's temporal lobe where it has been stored since my University days.
"Hippocampus" is a curved ridge of tissue in each cerebral hemisphere of the brain, concerned with basic drives, emotions, and short-term memory and forming part of the limbic system.
Oh yes, it is also a mythological sea creature with the head and forelegs of a horse and the tail of a fish. That's all I can remember.
btw. You can also find all of the above facts in the Encarta Concise English Dictionary in my personal library.
Hope this helps. Have a nice day.
Dutchy.