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Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans
Published on: December 18, 2016
White matter loss in healthy ageing: a postmortem analysis.
O Piguet1, K L Double, J J Kril
1Prince of Wales Medical Research Institute and the University of New South Wales, NSW, Australia. o.piguet@powmri.edu.au
Neurobiology of Aging
|December 14, 2007
Summary
Healthy brain aging primarily affects white matter, not grey matter. Postmortem studies reveal smaller age-related volume changes compared to neuroimaging, suggesting healthy brain aging predominantly impacts white matter integrity.
Area of Science:
- Neuroscience
- Gerontology
- Anatomy
Background:
- Age-related brain volume changes are well-documented but inconsistently reported.
- Discrepancies exist between neuroimaging and postmortem studies regarding the extent of age-related brain volume loss.
- The precise impact of chronological age on specific brain regions remains debated.
Purpose of the Study:
- To quantify age-related volume changes in 26 distinct brain regions using postmortem measurements.
- To compare postmortem findings with existing neuroimaging data on brain aging.
- To clarify the specific brain structures affected by healthy aging.
Main Methods:
- Postmortem volume measurements of 26 cortical, subcortical, and white matter regions.
- Analysis of 24 human brains from individuals aged 46-92 years, free of neuropathological abnormalities.
- Comparison of regional volume changes with chronological age.
Main Results:
- Significant age-related volume loss was observed in anterior and posterior white matter.
- No significant age-related loss was detected in total grey matter volumes.
- Cortical subregion analyses showed smaller age-related changes than previously reported in MRI studies.
Conclusions:
- Healthy brain aging predominantly affects white matter, with minimal impact on grey matter volume.
- Postmortem studies indicate less pronounced age-related brain volume changes than neuroimaging studies.
- Discrepancies may stem from neuroimaging data noise, highlighting white matter's vulnerability in aging.
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