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Arachnoid Granulations of the SheepStructural and Ultrastructural Changes With Varying Pressure Differences
Daniel G. Gomez, PhD;
D. Gordon Potts, MD;
Vishnu Deonarine, RT
Arch Neurol. 1974;30(2):169-175.
Abstract
Sheep arachnoid granulations were examined to determine the morphologic changes induced by varying pressure differences between the subarachnoid space and the superior sagittal sinus. With the superior sagittal sinus pressure maintained at zero, increasing subarachnoid space pressures caused increasing distention of the arachnoid granulations. Granulations fixed in the distended state by combined subarachnoid and arterial perfusion of aldehydes remained distended even when the gradient was reduced to zero. Electron microscopic studies showed that as the pressure difference was increased (1) neighboring endothelial cell overlappings were shorter and the intercellular spaces were irregularly widened, (2) the endothelial-lined tubules became distended, (3) the endothelial cells showed increased pinocytotic activity, and (4) the stromal cellular and extracellular components were more separated.
Author Affiliations
New York
From the Department of Radiology, Cornell University Medical College, and the Neuroradiology Research Laboratory, William Hale Harkness Building, New York.
Footnotes
Accepted for publication July 25, 1973.
Reprint requests to Department of Radiology, Cornell University Medical College, New York 10021 (Dr. Gomez).
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