Human anatomy, including structure and development and practical considerations . aths by whichthis is accomplished include : (i) theextension of the subarachnoid spacealong the nerve-trunks, and (2) thevillous projections of arachnoid tissue,the Pacchionian bodies, along thecourse of the dural blood-sinuses. The Pacchionian bodies (gran-iilati(>nes arachnoidales) are numerouscauliflower-like excrescences of thearachnoid, for the most part small butoccasionally reaching a diameter of5 mm. or over, w^hich lie on the outersurface of the membrane along thecourse of the dural venous
Human anatomy, including structure and development and practical considerations . aths by whichthis is accomplished include : (i) theextension of the subarachnoid spacealong the nerve-trunks, and (2) thevillous projections of arachnoid tissue,the Pacchionian bodies, along thecourse of the dural blood-sinuses. The Pacchionian bodies (gran-iilati(>nes arachnoidales) are numerouscauliflower-like excrescences of thearachnoid, for the most part small butoccasionally reaching a diameter of5 mm. or over, w^hich lie on the outersurface of the membrane along thecourse of the dural venous favorite site is on either side ofthe superior longitudinal sinus, where they occur in groups, although they occur in smaller number and size in connec-tion with other sinuses, as the lateral, cavernous and straight. They consistentirely of arachnoid tissue and contain no blood-vessels. Although lying mostlyat the side of the longitudinal sinus with which they are then indirecdy relatedthrough the lateral diverticula, the laciince laterales or b/ood-lakcs, in some instances. Diagram showing relations of Pacchionian bodies toblood-spaces and dura; B. bone, S, longitudinal sinus;/-, lacuna; P, Pacchionian bodies; l, cerebral veinemptying into lacuna; SD, subdural space; dura is blueana pia is red, intervening tissue is arachnoid; A. i2o6 HIM AX ANATOMY. they encroach upon the lumen of the main channel itself, within which they appearas irregularly rounded projections on its lateral \valls. Whatever their relation,whether with the sinus or the lateral diverticula, the Pacchionian bodies never liefree within the blof)d-space, but are always separated from the latter by the dura!wall. Over the summit of the elevation the dura becomes greatly attenuated, butne\er entirely disapjjears, so that only a thin membrane and the subdural cleft,theoretically present but jiractically more or less obliterated, inter\ene between thesubarachnoid spaces and the blood-stream. This partition offe
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
