Abstract:
:Neuropathologic examination in elderly individuals and patients with Parkinson's disease with and without dementia reveals abundant isocortical amyloid deposits with no or only a few neuritic plaques, neuropil threads (NT), and neurofibrillary tangles (NFT), whereas NT and NFT may be present only in the entorhinal region of the parahippocampal cortex. In Down's syndrome, Alzheimer's disease, and Parkinson's disease, early neuronal degeneration with deposition of NT and NFT may selectively involve layer pre-alpha (II) of the entorhinal region (Brodmann 26 area) forming the origin of the glutamatergic perforant pathway. Its bilateral destruction isolates the hippocampus from isocortical influx. Comparative studies in a series of aged subjects and those with Parkinson's disease show that psychostatus correlates better with the number of NT and NFT in the entorhinal region than in hippocampal area CA-1 and isocortex. This pattern of neuronal degeneration may explain cognitive impairment in early stages of both Alzheimer's and Parkinson's diseases.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Jellinger K,Braak H,Braak E,Fischer Pdoi
10.1111/j.1749-6632.1991.tb00218.xsubject
Has Abstractpub_date
1991-01-01 00:00:00pages
203-9eissn
0077-8923issn
1749-6632journal_volume
640pub_type
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