cool stuff. I stumbled onto it looking up limbic system
VERY excellent material here.
The Archipallium, or the reptilian/primitive brain, is wrapped by the paleopallium, or the old-mamillian brain (aka limbic system), which is further wrapped by the neopallium, which is almost the entire mass of the two hemispheres.
Archipallium is self preservation, body control, etc. Basically, this is the reptile in us.
Paleopallium is emotions and affect. This is responsible for motherly instincts, playfulness, and more.
Neopallium is responsible for what we consider logical thought.
All three of these sections are interconnected, but they also operate independantly. This is why you can "zone out", or detatch from things in thought, but still continue another process that you have done many many times. This is also why emotions can block out rational thought. It's actually a separate subsystem that can simply override what you're thinking.
Fear and love and similar emotions can easily rule you. Rather than fighting against emotions, we have to learn how to work with them.