Cited by 449Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchMemory and Neural Mechanisms

Memory‐related neural systems in Alzheimer's disease: An anatomic study

Hyman, B. T., Hoesen, G. W. Van, Damasio, A. R.·1990·Neurology

Abstract

In the primate brain, there are strong connections among the entorhinal cortex, the hippocampal formation, and the amygdala, 3 structures of the ventromedial temporal lobe that are related to memory function. Because memory impairment is a central feature of Alzheimer's disease, we examined the probable cells of origin and terminal zones of these connections in the brains of humans affected by the disease, using thioflavine S, Alz-50, and anti-A4 amyloid protein immunocytochemistry. Specific cytoarchitectural areas and lamina that give rise to projections from the entorhinal cortex, the hippocampal formation, and the amygdala consistently contained neurofibrillary tangles. The terminal zones of many of these projections contained neuritic plaques, Alz-50-positive neuritic alterations, and A4 deposition. Other cytoarchitectural areas and lamina, sometimes immediately adjacent, were consistently spared from these Alzheimer changes. This pattern of Alzheimer-related alterations would disrupt projections among the entorhinal cortex, hippocampal formation, and amygdala at multiple sites, and also disrupt projections between these structures and cortical and subcortical targets. In functional terms, this pattern of structural damage is likely to be as devastating as bilateral destruction of the ventromedial temporal lobe, and thus contribute substantially to the memory disorder seen in this condition.

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Crossref · 10.1212/wnl.40.11.1721

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  • According to Hyman et al., episodic memory deficit in AD results from anatomical and functional segregation of hippocampus from associative sensory inputs due to degeneration of perforant pathway.

    “Indeed, according to Hyman et al. [29], [30], the episodic memory deficit in AD patients results from the anatomical and functional segregation of the hippocampus from associative sensory inputs due to degeneration of the perforant pathway.”

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Authors
Hyman, B. T., Hoesen, G. W. V., & Damasio, A. R.
Affiliations
University of Iowa (US)
Venue
Neurology
Published
1990-11
Volume
40
Issue
11
Pages
1721-1721
ISSN
  • 0028-3878 (ISSN-L)
  • 1526-632X
OpenAlex
W2160683996
Cited by
449
References
0
Citations by year
2025: 4 · 2024: 3 · 2023: 3 · 2022: 2 · 2021: 8 · 2020: 9 · 2019: 5 · 2018: 3 · 2017: 6 · 2016: 3 · 2015: 10 · 2014: 5 · 2013: 7 · 2012: 7
FWCI
16.38
Type
journal article
Language
en
Open access
closed
Locations
  • Neurology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Aging (AG-08487)
  • National Institute of Neurological Disorders and Stroke (P0 NS 19632, R01NS014944, NS-14944)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
Alzheimer's disease, memory impairment, entorhinal cortex, hippocampal formation, amygdala, neurofibrillary tangles, neuritic plaques, thioflavine S
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Amygdala, Brain, Hippocampus, Humans, Immunohistochemistry, Memory, Middle Aged, Neurofibrils, Temporal Lobe

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