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Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
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Fluid dynamics in aging-related dementias.

Thierno M Bah1, Dominic A Siler2, Aseel H Ibrahim3

  • 1Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, OR, USA.

Neurobiology of Disease
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The brain

Keywords:
AgingDementiaFluid dynamicsGlymphaticsMeningeal lymphaticsNeurodegenerative diseases

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Area of Science:

  • Neuroscience
  • Immunology
  • Aging Research

Background:

  • Recent studies reveal novel pathways for CNS fluid movement, immune cell trafficking, and waste clearance.
  • These pathways, including the glymphatic system and meningeal lymphatics, are potentially impaired in aging and dementia.
  • Alzheimer's disease (AD) and related dementias may involve dysfunction of these clearance systems.

Purpose of the Study:

  • To provide an overview of the glymphatic and meningeal lymphatic systems.
  • To review methods for studying glymphatic flow in humans and animals.
  • To discuss the role of these systems in CNS homeostasis and disease.

Main Methods:

  • Review of experimental studies in human and animal models.
  • Discussion of current techniques for assessing glymphatic flow.
  • Analysis of existing evidence and controversies regarding CNS fluid dynamics.

Main Results:

  • Novel pathways for CNS fluid and waste transport have been identified.
  • Evidence suggests these pathways may be compromised in aging and neurodegenerative diseases like AD.
  • Current understanding of glymphatic system function in health and disease is evolving.

Conclusions:

  • The glymphatic and meningeal lymphatic systems play crucial roles in CNS health.
  • Impairment of these systems is implicated in aging and dementia, including Alzheimer's disease.
  • Non-invasive imaging is needed to fully elucidate these pathways across the lifespan.