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. 2012 Mar 24;3:40. doi: 10.4103/2152-7806.94292

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Copyright: © 2012 Sotelo J.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Physiological differences of hydrostatic pressure within the ventriculosubarchanoid axis according to the posture of the individual. When sitting or standing, a gradient of pressure develops in which there is absence of pressure in the ventricular cavity but a maximal pressure of 500 ± 50 mm H₂O in the lumbar area . In contrast; when the subject lies down, the pressure is evenly distributed along the ventriculosubarachnoid axis with an identical mean value of 150 ± 50 mm H₂O anywhere from the ventricular cavities to the lumbar area

Inline graphic — Physiological differences of hydrostatic pressure within the ventriculosubarchanoid axis according to the posture of the individual. When sitting or standing, a gradient of pressure develops in which there is absence of pressure in the ventricular cavity but a maximal pressure of 500 ± 50 mm H₂O in the lumbar area . In contrast; when the subject lies down, the pressure is evenly distributed along the ventriculosubarachnoid axis with an identical mean value of 150 ± 50 mm H₂O anywhere from the ventricular cavities to the lumbar area