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Arachnoid Villi and Granulations

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Although as early as 1900 CUSHING believed that wide, valve-like passages linked the meningeal spaces to the adjacent veins, the work of WEED persuaded him that these passages did not exist (1,2). The concept that the arachnoid villus is a blind diverticulum of arachnoid that projects into a venous channel, and that it serves as a membrane through which cerebrospinal fluid passes into the blood stream was then widely accepted, WELCH and FRIEDMAN (3) reported in 1960 that the arachnoid villus of the monkey forms a labyrinth of small tubules that establish open connections between the subarachnoid space and the venous blood and they felt that these tubules had a valve-like function. This would imply a pressure-dependent passive mechanism for the passage of cerebrospinal fluid through the arachnoid villus.


  • Pressure Difference
  • Subarachnoid Space
  • Superior Sagittal Sinus
  • Surface Endothelial Cell
  • Pinocytotic Vesicle

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  • DOI: 10.1007/978-3-642-66086-3_9
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© 1975 Springer-Verlag Berlin Heidelberg

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Potts, D.G., Gomez, D.G. (1975). Arachnoid Villi and Granulations. In: Lundberg, N., Pontén, U., Brock, M. (eds) Intracranial Pressure II. Springer, Berlin, Heidelberg.

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  • Print ISBN: 978-3-642-66088-7

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