Related Experiment Videos
The acoustic cortex in Alzheimer's disease
S J Baloyannis1, S L Manolidis, L S Manolidis
1Department of Neurology, Aristotelian University, Thessaloniki, Greece.
Acta Oto-Laryngologica. Supplementum
|January 1, 1992
Summary
Alzheimer's disease significantly alters the acoustic cortex, causing neuron damage and synaptic changes. These brain changes in Alzheimer's patients may explain language and memory deficits.
Area of Science:
- Neuroscience
- Neuropathology
Background:
- Alzheimer's disease (AD) is a neurodegenerative disorder characterized by cognitive decline.
- The acoustic cortex, crucial for auditory processing and language, is affected in AD.
Purpose of the Study:
- To investigate the morphological changes in the acoustic cortex of post mortem Alzheimer's disease cases.
- To correlate these changes with cognitive deficits observed in AD.
Main Methods:
- Light and electron microscopy were used on post mortem brain samples from 6 AD cases.
- Silver impregnation and routine staining techniques were applied.
- Morphological findings were compared to normal controls and temporal isocortex.
Main Results:
- Significant loss of dendritic spines and decreased axonic collaterals in cortical layers II, III, and IV.
- Neurofibrillary tangles and senile plaques were prevalent throughout the acoustic cortex.
- Electron microscopy revealed paired helical filaments (PHF), Hirano bodies, and synaptic alterations, including reduced synaptic contacts per dendritic spine.
Conclusions:
- Morphological damage in the acoustic cortex, including synaptic alterations, likely contributes to the verbal memory deficits and language disturbances characteristic of early Alzheimer's disease.
- These findings highlight the acoustic cortex as a key area affected by Alzheimer's pathology.