Brain surgery . Fig. 9.—The Guiding Lines of Reid and the Relation of the Chief Convolutions to theni. it necessary to ascertain the relation of its differentfissures and convolutions to the cranial sutures, or tocertain landmarks upon the surface of the head. Theserelations are well shown in the figure (Fig. T), whichis a photograph of a cast of a head made immediatelyafter death by Dr. Cunningham, of Numer- 1 See Dublin Journ. Med. Sc, 1888, p. 157. For an opportunityof photographing this cast I am indebted to Dr. F. Ferguson, Cura-tor of the Museum of the New York Hospital. 16 BRAI
Brain surgery . Fig. 9.—The Guiding Lines of Reid and the Relation of the Chief Convolutions to theni. it necessary to ascertain the relation of its differentfissures and convolutions to the cranial sutures, or tocertain landmarks upon the surface of the head. Theserelations are well shown in the figure (Fig. T), whichis a photograph of a cast of a head made immediatelyafter death by Dr. Cunningham, of Numer- 1 See Dublin Journ. Med. Sc, 1888, p. 157. For an opportunityof photographing this cast I am indebted to Dr. F. Ferguson, Cura-tor of the Museum of the New York Hospital. 16 BRAIN SURGERY. ous rules have been laid down for the determinationof the location of various parts of the convex surfaceof the hemisphere upon the head. The most impor-tant are the following, which may be compared withthe diagram (Fig. 8), and with Reids figures (Fig. 9).. 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
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