What areas of the brain are activated to produce the symptoms of Schizophrenia?

I realize what the symptoms of schizophrenia are, but what areas of the brain must be effected in order to experience such symptoms?  For instance, the hallucinations must be caused by activation of certain areas of the brain, what are these areas?  Similarly, delusions - what areas of the brain must be working to create these delusions?  What areas are being activated to produce the negative symptoms of schizophrenia?  Do we know this kind of stuff??

[HFHS-M.D.-HG]

Dear Kam,

               Since  the past decade, a lot of  research is  going on about  Schizophrenia. The major brain areas implicated in Schizophrenia are the limbic structures, the  frontal lobes and basal ganglia. It was previously determined that the hippocampal area of affected person was smaller and had a smaller increase in blood flow to the dorsolateral  prefrontal cortex. Computed Tomography (CT scan) studies  showed that the brains of  patients with schizophrenia have lateral and third ventricular enlargement and some reduction in cortical volume. These CT scan  abnormalities correlated with the presence of negative symptoms. Abnormalities in neurotransmitters like dopamine, serotonin and norepinephrine were noticed in schizophrenic patients. Dopamine was found to be contributing to psychotic symptoms(delusions and hallucinations) . Several other factors- genetic, immunological and psychosocial factors have been studied with regards to schizophrenia.