A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . r cent, of the total. It waspresent to a considerable extent, either generally dis-persed or in special trunks only, in 175 cases, andto a less extent in The relative frequency bylocation was: medicerebral, 38 per cent.; basilar, 30per cent.; postcerebral, 21 per cent.; carotid, 10 percent. Mendel (1891) has found experimentally that thepressure in the cortical arteries is materially less thanthat in the carotids, while that in the striatal arteriesis not mat
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . r cent, of the total. It waspresent to a considerable extent, either generally dis-persed or in special trunks only, in 175 cases, andto a less extent in The relative frequency bylocation was: medicerebral, 38 per cent.; basilar, 30per cent.; postcerebral, 21 per cent.; carotid, 10 percent. Mendel (1891) has found experimentally that thepressure in the cortical arteries is materially less thanthat in the carotids, while that in the striatal arteriesis not materially less. This he attributes to thefact that the latter are terminal vessels, though it isdoubtless quite as much due to their less circuitoussupply. He further thus explains the frequency ofhemorrhage in the striatal region. Tedeschis conclusions regarding the brain arteriesrefer in part to moot points, but really contain nothingnew and are deceptive in statement. Veins. The venous passages of the brain and its membranesinclude: I. The dural veins. II. The intrinsic veins, or those of the brain proper. III. The Fig. 1004.—The Vena Galeni. (From authors Veins of the Brain, etc.) 20-22) determined their average diameters in 45cases (insane). That of the vertebral was, r. , 1. ; of basilar, ; of postcerebral,r. , 1. ; of carotid, r. , 1. ; of medi-cerebral, r. , 1. ; and of precercbral, r. ,1. The sectional areas are of course propor-tional to the square of these diameters. .\s a rule, theunited areas of branches equal very nearly the area ofthe parent trunk—excepting the preponderance of thevertebrals over the basilar ( to ). Lowenfeld has found that the relation of the arterywidth to the brain weight is, even , somewliatvariable, and that often, though not by any meansin all cases, the width of the brain vessels rises andfalls with the width of the aorta; moreover, that notrarely abn
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
