. Medical and surgical therapy . fissures of Rolando, of which it forms the anteriorlip. It terminates above the Sylvian fissure, passinground below the lower end of the fissure of Rolandoto unite with the inferior extremity of the ascendingparietal, thus forming the rolandic operculum. The ascending parietal convolution also follows thecurvatures of the fissure of Rolando, of which it formsthe posterior lip. Its upper part is much narrowerthan the corresponding portion of the ascendingfrontal, with which its lower extremity is united abovethe Sylvian fissure by bending round the lower end oft
. Medical and surgical therapy . fissures of Rolando, of which it forms the anteriorlip. It terminates above the Sylvian fissure, passinground below the lower end of the fissure of Rolandoto unite with the inferior extremity of the ascendingparietal, thus forming the rolandic operculum. The ascending parietal convolution also follows thecurvatures of the fissure of Rolando, of which it formsthe posterior lip. Its upper part is much narrowerthan the corresponding portion of the ascendingfrontal, with which its lower extremity is united abovethe Sylvian fissure by bending round the lower end ofthe fissure 3f Rolando. This bend forms the rolandicoperculum, which covers the deep convolutions of theinsula. The upper end of the convolution is bent GU WOUyDS OF THE BliMN round the upper end of the fissure of Rolando, andunites with the upper end of the ascending frontal toform the paracentral lobule. The paracentral lobuleis thus mainly made up of a thick frontal portion anda narrow and slender ))arietal portion. It will be. Kk;. 7.—Kxtonial and internal aspects of one hemisphere andinferior aspect of the brain. The cftnvohitions are marked by-a letter with an indicator; Fj, firstfrontal; Fa, ascending frontal, etc.; (!s, gyi^i^ su])ramarginalis ; (la,gyrus angularis; R, fissure of Rolando ; Sy, Sylvian fissure ; , paracentral lobule; L. ling, lingual lobule; L. fus, fusiformlobule, evident that the ascending frontal and parietal con-volutions form a true central lobe, which deserves tobe studied apart from the respective lobes of whichit forms part, because of its intimate union, itsanatomical arrangement, and its physiological pro-perties, which will be stated later. Central motor and sensory tracts.—A whole system }VOUNns OF THfJ HOLWDIC AliKA (;13 of white fibres which form the central motor andsensory tracts is connected with the portion of thecerebral cortex that has just been described. The central motor tract or centrifugal tract is formedof sever
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsurgery, bookyear1918
