Walsh & Hoyt: Cerebrospinal Fluid Figure 39.68. Drawing of a Normal Arachnoid Villus

Figure 39.68. Drawing of a normal arachnoid villus. The inset (upper left) shows the superior sagittal sinus in cross section. The large drawing shows the area within the small rectangle in the inset. A, Loosely organized endothelial space in arachnoid villus. B, Meshwork of arachnoid cells and collagen that forms core of the villus. C, Endothelium of the sinus reflected over the villus and separating it from the sinus lumen. D, Lumen of the SSS. E, Dural wall of sinus. F, Arachnoid cells lining the inner aspect of the arachnoid membrane. G, Subarachnoid space containing arachnoid cells, fibrous trabeculae, and a large blood vessel. H, Pia mater. (From Shabo A, Maxwell D. The morphology of the arachnoid villi: A light and electron microscopic study in the monkey. J Neurosurg 1968;29 451-463.)