Brain surgery . Fig. 10.—The lines indicating the fissures of Rolando and Sylvius laid down on theskull according to the rules given in the text and the relative situation of the func-tional areas of the cortex to these lines : the right hemisphere. To find the fissure of Rolando, lay down a line fromthe root of the nose to the occipital protuberance overthe top of the head, and take a point of thedistance back upon this line. This point will corre-spond to the upper end of the fissure. The fissuremakes an angle of 67° with the median line just THE DIAGNOSIS OF CEREBRAL DISEASE. 17 measu
Brain surgery . Fig. 10.—The lines indicating the fissures of Rolando and Sylvius laid down on theskull according to the rules given in the text and the relative situation of the func-tional areas of the cortex to these lines : the right hemisphere. To find the fissure of Rolando, lay down a line fromthe root of the nose to the occipital protuberance overthe top of the head, and take a point of thedistance back upon this line. This point will corre-spond to the upper end of the fissure. The fissuremakes an angle of 67° with the median line just THE DIAGNOSIS OF CEREBRAL DISEASE. 17 measured. Hence if two strips of metal fixed to oneanother at this angle be placed on the head with theirjunction upon the upper end of the fissure, when onestrip is on the median line the other strip, pointingforward and downward, must lie over the. fissure of. Fig. 11.—The lines indicating the fissures of Rolando and Sylvius laid down onthe skull according to the rules given in the text and the relative situation of thefunctional areas of the cortex to these lines: the left hemisphere. Rolando. In its lower third the fissure becomes alittle more vertical than the strip. The fissure isabout three and a half inches long. To find the fissure of Sylvius, lay down a base linefrom the lower margin of the orbit to the auditory mea-tus. Lay down a second line parallel to the base line 18 BRAIN SURGERY. from the external angular process of the frontal honebackward one inch and a quarter and then measureupward one quarter of an inch; this gives point the most prominent part of the parietal emin-ence and from it draw a line downward perpendicu-lar to the base line, and on this take a point three-quarters of an inch below the eminence; this givespoint two. Join these two points and the line will lieover the fissure of Sylvius. The anterior l
Size: 1488px × 1679px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidbrainsur, booksubjectbrain
