Lectures on localization in diseases of the brain, delivered at the Faculté de médecine, Paris, 1875 . stance {substantiaperforata). These are the arteries of the central gray ganglia,or more definitely, the arteries of the corpora striata. Letus here examine the cortical system, leaving for the momentthe gray ganglia. At the bottom of the fissure of Sylvius is seen the islandof Reil, on a level with which the Sylvian artery divides intofour branches, each of which deserves a special name. Thesebranches follow the furrows that separate the convolutions ofthe island and to which they furnish

Lectures on localization in diseases of the brain, delivered at the Faculté de médecine, Paris, 1875 . stance {substantiaperforata). These are the arteries of the central gray ganglia,or more definitely, the arteries of the corpora striata. Letus here examine the cortical system, leaving for the momentthe gray ganglia. At the bottom of the fissure of Sylvius is seen the islandof Reil, on a level with which the Sylvian artery divides intofour branches, each of which deserves a special name. Thesebranches follow the furrows that separate the convolutions ofthe island and to which they furnish Stock Photo
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Lectures on localization in diseases of the brain, delivered at the Faculté de médecine, Paris, 1875 . stance {substantiaperforata). These are the arteries of the central gray ganglia, or more definitely, the arteries of the corpora striata. Letus here examine the cortical system, leaving for the momentthe gray ganglia. At the bottom of the fissure of Sylvius is seen the islandof Reil, on a level with which the Sylvian artery divides intofour branches, each of which deserves a special name. Thesebranches follow the furrows that separate the convolutions ofthe island and to which they furnish vessels. They then bendinwards and outwards, and rise again to the surface of the ARTERIAL CIRCULATION IN THE BRAIN. 45 hemisphere, where they are distributed, as we have just said, over a certain number of fundamental convolutions, wherethey form a number of little secondary territories correspond-ing to each one of the convolutions. (Fig. 9.) 2^- fi-onfal coMvol?, .Ascending lirontal convolution j^-franlalc^mvolulion. |1 Ilf^-ffordal convqlation I Ascenijing jparietal anvydT! ^apTparietal lotule. J. Trunk of. Sylvian artery | v | -7*.; />-T3FapitalExl.&infr.lrontalbranQh ^i-^J.^^ . , ?, , . , -, , .Iscendmgfrontalarteryj j vl-aneto• sphenoidal & sphenoidalartenealAscendin^ parietal artery Fig. 9.—Distribution of Sylvian artery. (Partially schematic.) We will not dwell, however, upon this description, but pro-ceed to examine more thoroughly the manner in which thecortical arteries are divided and distributed to the substanceof the pia mater before they penetrate the cerebral pulp. I should mention that the branches arising from the Sylvi-an artery immediately subdivide into branches of the thirdorder, to the number of two or three for each secondarytrunk. These tertiary branchlets constitute a kind of vascu-lar skeleton, upon which is grafted a system oi arborizations;that is a special and very original system of small vessels, which arise not only from the extremities of

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