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A new look at cerebrospinal fluid movement

Darko Orešković1, Marijan Klarica2

  • 1Ruđer Bošković Institute, Department of Molecular Biology, Bijenička 54, 10 000 Zagreb, Croatia.

Fluids and Barriers of the CNS
|August 5, 2014
PubMed

Insights

Cerebrospinal fluid (CSF) movement is not unidirectional but bidirectional, driven by cardiac cycles, respiration, and body posture. This complex CSF movement, rather than circulation, better explains substance distribution and brain homeostasis.

Area of Science:

  • Neuroscience
  • Physiology

Background:

  • Existing models propose unidirectional cerebrospinal fluid (CSF) circulation.
  • Recent reviews, like Brinker et al., highlight CSF circulation but may overlook critical data.
  • Understanding CSF dynamics is crucial for brain homeostasis and metabolite clearance.

Purpose of the Study:

  • To challenge the unidirectional CSF circulation model.
  • To propose an alternative model of CSF movement based on available data.
  • To re-evaluate the primary mechanisms of metabolite removal in the central nervous system.

Main Methods:

  • Analysis of existing clinical data.
  • Review of experimental results from various animal species.
  • Integration of physiological data on blood circulation, respiration, and posture.

Main Results:

  • Data do not support unidirectional CSF circulation.
  • Evidence strongly suggests cardiac cycle-dependent, bidirectional CSF movement.
  • Complex CSF movement explains bidirectional substance distribution within the CNS.
  • Capillary endothelium efflux transport may be more critical for brain homeostasis than CSF flow.

Conclusions:

  • The term "CSF movement" is more accurate than "CSF circulation".
  • Bidirectional CSF dynamics are influenced by physiological factors.
  • Efflux transport systems play a significant role in brain homeostasis.

Keywords:
AquaporinCerebrospinal fluid circulationCerebrospinal fluid movementCerebrospinal fluid secretionClassic hypothesis of cerebrospinal physiologyOrešković and Klarica hypothesis

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