Spits the brain into 3 parts, the cerebrum, cerebellum and connective tissue.
Damage to the cerebrum causes nausea and unconsciousness, while the cerebellum acts as a backup thought source. the connective tissue wraps around both parts and can cause severe bleeding.
eventually I want damage to the cerebellum to cause motor distress - but that kink hasn't quite been worked out yet.

This should work with any version .31 on onwards of current posting.

Credit to orkel of the bay12forums for the inner-outer brain split idea, as well as the guts tag.