After her death, Schiavo's body was taken to the Office of the District 6 Medical Examiner for Pinellas and Pasco counties, based in Largo, Florida. The autopsy occurred on April 1, 2005. It revealed extensive brain damage. The manner of death was certified as "undetermined." The autopsy was led by Chief Medical Examiner Jon R. Thogmartin. In addition to consultation with a neuropathologist (Stephen J. Nelson), Thogmartin also arranged for specialized cardiac and genetic examinations to be made. The official autopsy report was released on June 15, 2005. In addition to studying Terri Schiavo's remains, Thogmartin scoured court, medical and other records and interviewed her family members, doctors and other relevant parties. Examination of Schiavo's nervous system by neuropathologist Stephen J. Nelson, revealed extensive injury. The brain itself weighed only , only half the weight expected for a female of her age, height, and weight, an effect caused by the loss of a massive number of neurons. Microscopic examination revealed extensive damage to nearly all brain regions, including the cerebral cortex, the thalamus, the basal ganglia, the hippocampus, the cerebellum, and the midbrain. The neuropathologic changes in her brain were precisely of the type seen in patients who enter a PVS following cardiac arrest. Throughout the cerebral cortex, the large pyramidal neurons that comprise some 70% of cortical cells – critical to the functioning of the cortex – were completely lost. The pattern of damage to the cortex, with injury tending to worsen from the front of the cortex to the back, was also typical. There was marked damage to important relay circuits deep in the brain (the thalamus) – another common pathologic finding in cases of PVS. The damage was, in the words of Thogmartin, "irreversible, and no amount of therapy or treatment would have regenerated the massive loss of neurons."