Diseases of the nervous system .. . ne arteryis the most important of those arteries which pass to the cortex and supplythe occipital lobes, the gyrus hippocampi and the third temporal convolu-tion; this supplies the area of the fissura calcarina and the posterior divi-sion of the optic radiation of Gratiolet, an occlusion of which seriously impairsthe sense of sight. Among the arteries visible upon the base of the brain we see the vertebraland basilar arteries and. their branches, also the circle of Willis which is themost important; the middle cerebral artery just after its origin passes und
Diseases of the nervous system .. . ne arteryis the most important of those arteries which pass to the cortex and supplythe occipital lobes, the gyrus hippocampi and the third temporal convolu-tion; this supplies the area of the fissura calcarina and the posterior divi-sion of the optic radiation of Gratiolet, an occlusion of which seriously impairsthe sense of sight. Among the arteries visible upon the base of the brain we see the vertebraland basilar arteries and. their branches, also the circle of Willis which is themost important; the middle cerebral artery just after its origin passes underthe lowest part of the temporal lobe and disappears in the depth of the brain. Diseases of the cerebral arteries and hemorrhages, thromboses and emboliwith resultant secondary softening of extensive areas of the brain form thelargest proportion of all diseases of the brain. Therefore it is important forus to recognize that the distribution of the individual arteries throughout Insula A. commiuiicansanterior ^. A. cerebri anterior. ^-~^A. cerebellisuperior A. basilaria A. spinalis posterior Radix anterior ofN. cervicalis I — Rami spinales of A. vertebralis Fig. 18.—The Distributioint of the Arteries at the Base of the Braix axd the Circle OF frontal lobes have been slightly separated to show the course of the two anterior cere-bral arteries as far as the genu of the corpus callosum; the right lateral cerebral fissure hasbeen somewhat widened to show the branching of the middle cerebral artery. On removalof the left cerebellar hemisphere, the distribution of the posterior cerebral artery upon thebasal surface of the occipital and temporal lobes becomes visible. 27 28 MACROSCOPIC ANATOMY OF THE CENTRAL NERVOUS SYSTEM the cortex of the brain coincides in the main with the areas of the cerebralcenters, so that, following hemorrhages or embolisms which are not too exten-sive, isolated s3miptoms of the absence of definite functions may appear. Themost frequent are hem
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