. A treatise on nervous and mental diseases, for students and practitioners of medicine. from the basilar and the anterior ascend perpendicularly in the raphe nearly to the gray matter,and supply the nuclei and the ependyma of the fourth ventricle,breaking up into fine networks for the different nuclei. They areterminal arteries. The anterior spinal artery is sometimes onlypresent on one side, sometimes double, sometimes arising from eachvertebral, but these branches generally unite in one stem. Whenthere is only one, it generally arises from the left vertebral; if thereare two, th
. A treatise on nervous and mental diseases, for students and practitioners of medicine. from the basilar and the anterior ascend perpendicularly in the raphe nearly to the gray matter,and supply the nuclei and the ependyma of the fourth ventricle,breaking up into fine networks for the different nuclei. They areterminal arteries. The anterior spinal artery is sometimes onlypresent on one side, sometimes double, sometimes arising from eachvertebral, but these branches generally unite in one stem. Whenthere is only one, it generally arises from the left vertebral; if thereare two, they are generally strongly anastomosed. The left verte-bral is usually larger than the right. The radicular arteries arisefrom one of the larger branches that have been spoken of, and pass 76 INTRODUCTORY, iuto the vessels that terminate ou the uerve roots in arterioles whichhave a diameter of one-third to one-fourth millimetre. These con-sist of ascending and descending branches, the latter passing to thenucleus, breaking up into a capillary network. It is therefore evident Fig. Inner surface of right hemisphere. (After Duret). Distribution of Vessels. The regions bounded by the line ( ) represent the territories over which the branches of the anterior cerebial artery are distributed. I. Is the territory of the interior and anterior frontal artery, II. Is the territory of the internal and middle frontal artery. III. Is the territory of the internal and posterior frontal artery. The regions bounded by the line ( ) represent the territories over which the branches of the posterior cerebral artery are Is the territory of the posterior temporal Is the territory of the occipital artery. Fissures and Convolutio7is. CC. Corpus callosum, longitudinally divided. Gf. Gyrus fornicatus. H. Gyrus hip-pocampi, h. Sulcus hippocampi. Z7. Uncinate gyrus, cm. Sulcus ^i. Median aspect of the first frontal convolution, c. Fissure of Rolando. A.
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