Actually, the funny thing is that Brontosaurs are said to have had brains in their ass! Seriously. There was what is more properly called a "ganglial mass" of neurons near the Brontosaurs' tookus. A lot of dinosaur stuff since I read about that has turned out to be silly misunderstandings, so I may be quoting ridiulously out-of-date stuff, but the though was that it serves as a sort of secondary brainstem, because the hind quarters were so far from the skull, and neural electrochemical transmission is actually very slow.
You're out of date. There is no such thing as a Brontosaur anymore. They are Apatosaurs now. What they thought was a Brontosaur turned out to be a misidentification of a Apatosaur, so the earlier discovered one, the Apatosaur, gets to keep the name and Brontosaurs are no more.
I believe you're confusing Brontosaurus with Stegosaurus, which had the ganglial mass at the base of it's tail. The tail itself had sharp tusks at the end which could have been used to defend the Stegosaurus from predators. The ganglial mass was thought to be the "brain" for the tail.
Thanks, dangus. . .interesting stuff. . . particularly that of 'brains' located in a posterior location; and all this time I just thought it was anatomical pecularity of Liberals. . .