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Related Experiment Videos

Aging and the human neocortex.

Bente Pakkenberg1, Dorte Pelvig, Lisbeth Marner

  • 1Research Laboratory for Stereology and Neuroscience, Bispebjerg Hospital, Bispebjerg Bakke, Copenhagen NV 2400, Denmark. forkslab@bbh.hosp.dk

Experimental Gerontology
|January 25, 2003
PubMed
Summary
This summary is machine-generated.

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Human brain aging shows minimal neuron loss but significant reduction in myelinated fiber length. Glial cell counts remain stable, though sex differences impact brain structure more than age.

Area of Science:

  • Neuroscience
  • Human Anatomy
  • Stereology

Background:

  • Neurostereology enables quantitative analysis of human brain structure.
  • Previous studies have quantified neurons, glial cells, myelinated fibers, and synapses.

Purpose of the Study:

  • To investigate the effects of aging and sex on human brain structural elements using neurostereology.
  • To quantify neuron numbers, glial cell counts, myelinated fiber length, and synapse counts in the neocortex.

Main Methods:

  • Application of neurostereology for quantitative anatomical studies.
  • Analysis of neocortical neuron and glial cell numbers.
  • Measurement of total myelinated fiber length and synapse counts.

Main Results:

Related Experiment Videos

  • Neuron numbers showed less than 10% difference between ages 20 and 90.
  • Glial cell numbers were not significantly different between young and elderly individuals.
  • Total myelinated fiber length decreased significantly with age, while synapse counts reached approximately 0.15 quadrillion.

Conclusions:

  • Aging affects brain structure, notably reducing myelinated fiber length.
  • Sex differences have a more pronounced effect on brain structure than aging.
  • The functional significance of age- and sex-related structural differences remains undetermined.