Sharon is afraid to go out in public, because of the strange things that happen to her lately. Sometimes she has terrible sexual desires that she can just barely restrain. Sometimes she goes from restaurant to restaurant and eats 4-8 meals a day. Sometimes she goes to a water fountain and drinks water for 15 minutes straight. Sometimes she feels tremendous love for her boyfriend and then, without warning, hates his guts. Sometimes she is happy and then suddenly becomes angry. After seeing her doctor and undergoing a few neuroimaging procedures, doctors have explained that t here is a tumor growing in Sharon's brain that is causing all these strange behaviors.
1) Where is the tumor growing in Sharon's brain?
2) Can you name three behaviors regulated by the part?
3) Can you name the evolutionarily very old brain system of which this brain part is part of?