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What keeps the cerebrospinal fluid circulating? Is it pumped by something?

This picture from wikipedia seems to indicate that it pulsates as though it is pumped:

CSF

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I think you need to re-examine this issue in light of the new answer. –  anongoodnurse Jun 4 at 5:02
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@Tim, please unaccept Nick Stauner's answer in favor of the one backed by reproducible research. –  blz Jun 4 at 16:58

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up vote 2 down vote accepted

There is no evidence that the CSF has a pump, especially not a spinal pump as suggested by Dr. Jockers in the above answer. Dr. Jockers calls himself a "Maximized Living Doctor" but does not list his credentials. It is likely that he is a Doctor of Chiropractic; his references for the CSF pump article are dead ends: One is a dead link, two are references back to his Natural News page and one is a link to a Chiropract Medicine page (a good one, from my reading) in which the author himself states:

It is something of a misnomer to speak of CSF “circulation,” particularly in the spinal canal, as there is no continuous loop circulation of CSF as in the cardiovascular system. [CEREBROSPINAL FLUID STASIS AND ITS CLINICAL SIGNIFICANCE Whedon et. al., Altern Ther Health Med. 2009 May–Jun; 15(3): 54–60.]

This is in keeping with the findings of decades of research in western medicine (M.D., Ph.D., D.O., etc.)

For quite some time, it has been known that CSF movement results from the formation of new CSF and motion of cilia on the surface of the choroid plexus and ependyma lining the ventricles. - Fluids and Barriers of the CNS

The "circulation" of the CSF, as already mentioned, is something of a misnomer. CSF is not known to "circulate" in the manner of blood. It does get agitated by pressure differentials, and it is 'circulated' in terms of being reabsorbed and replaced every 6-7 hours. Other than that, no circulation occurs.

Blood circulation is not generated only by the heart. Pressure differentials throughout the body affect the circulation of blood as well. One that is easily demonstrated (first documented in 1733) is the effect of intrathoracic (chest) pressure on circulation. The blood pressure of healthy people falls during spontaneous inspiration. When someone takes a deep breath, the blood return to the heart via the vena cava decreases, and pressure is exerted on the right atrium. Both cause decreased filling, which will drop blood pressure. Although this is best demonstrated with a blood pressure cuff, it can be demonstrated without. An unrecommended method is exemplified in a childhood game of passing out. A Valsalva maneuver (deep breath and glottal closure) decreases blood flow to the heart. Squeezing the chest further decreases return, resulting in fainting.

The same pressure differentials agitate the CSF. Additionally, smaller movements were seen with pressure differentials caused by the beating of the heart.

By employing this respiration-induced spin labeling bSSFP cine method, we were able to visualize CSF movement induced by respiratory excursions. CSF moved cephalad (16.4 ± 7.7 mm) during deep inhalation and caudad (11.6 ± 3.0 mm) during deep exhalation in the prepontine cisternal area. Small but rapid cephalad (3.0 ± 0.4 mm) and caudad (3.0 ± 0.5 mm) movement was observed in the same region during breath holding and is thought to reflect cardiac pulsations.

The image in the OP's question is of a patient with normal pressure hydrocephalus (NPH) showing pulsations of CSF with heartbeat, nothing more.

There are other factors that cause movement of CSF, but they are intermittent and variable.

Influence of respiration on cerebrospinal fluid movement using magnetic resonance spin labeling, Yamada et. al., Fluids and Barriers of the CNS 2013, 10:36
MRI showing pulsation of CSF

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Well, that sure seems to make more sense than Jockers. Thanks for your answer. I'd delete mine if it wasn't accepted (and I hope yours will be instead...@Tim). –  Nick Stauner Jun 4 at 5:56

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