Braak stages[4]1 tau tangles at entorhinal cortex2 tau tangles and neuronal death at entorhinalcortex3 tau tangles and neuronal death moreextensively at entorhinal cortex4 tau tangles and neuronal death at entorhinalcortex and hippocampus5 tau tangles and neuronal death at entorhinalcortex, hippocampus, and neocortex6 tau tangles and neuronal death moreextensively at entorhinal cortex, hippocampus,and neocortex