Answer: Dentate Gyrus
According to a CNN article, every one of us has a dentate gyrus within our hippocampi and it is related to our ability to remember things. The article describes a new study that shows that when mice work out they build new brain cells in their dentate gyri thereby combating the loss of memory associated with getting older.
What’s that, a spinning toothy thing?? I’m looking this up, hold on…haha, it is! It’s shaped like a twisty spiral tooth! Here’s the link to Wikipedia.
Excellent find on the “mice working out” picture, by the way.