The collective term for the specialized physiological processes, primarily the glymphatic system, responsible for clearing metabolic byproducts, interstitial fluid, and potentially neurotoxic protein aggregates from the central nervous system. This continuous clearance is mandatory for long-term neural health.
Origin
This descriptive term refers to the function of the glymphatic system, a lymphatic-like waste clearance pathway unique to the brain, which was formally described in the early 2010s. The term “disposal” underscores the critical removal of detrimental substances like beta-amyloid.
Mechanism
This disposal mechanism relies on the bulk flow of cerebrospinal fluid through the brain’s perivascular and interstitial spaces, a flow that is significantly enhanced during deep sleep. The process is facilitated by astrocytic water channels, Aquaporin-4, and is influenced by the autonomic nervous system and circulating hormones. Impaired waste disposal is a major factor in the pathogenesis of neurodegenerative diseases.
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