A manual of modern surgery : an exposition of the accepted doctrines and approved operative procedures of the present time, for the use of students and practitioners . square applied. Fig. 81. any operative procedure based on cerebral localization. This may notbe necessary if any external injury or scar indicates the probable seatof lesion. This fissure has its upper end 50 or 55 millimeters behindthe bregma or junction of the inter-parietal and coroneal sutures, but doesnot quite reach the middle line ofthe skull. The bregma is found bydrawing a vertical plane through thetwo external auditory
A manual of modern surgery : an exposition of the accepted doctrines and approved operative procedures of the present time, for the use of students and practitioners . square applied. Fig. 81. any operative procedure based on cerebral localization. This may notbe necessary if any external injury or scar indicates the probable seatof lesion. This fissure has its upper end 50 or 55 millimeters behindthe bregma or junction of the inter-parietal and coroneal sutures, but doesnot quite reach the middle line ofthe skull. The bregma is found bydrawing a vertical plane through thetwo external auditory openings. Thelower end of the Rolandic fissure isabout six centimeters above and a lit-tle behind the external auditory makes an angle of 67 degrees withthe median line drawn from the gla-bella, or smooth spot at the root of thenose, to the external occipital protuber-ance, or inion; and has its upper endbeginning on a line with a spot situated55j7¥ per cent, of the total distance fromthe glabella to the inion. The illustrations show two methods of de-termining the location of the Rolandic sulcus : that by Brocas squareand that by Wilsons Chienes method of obtaiuiug an angleof 67% degrees for fixing position of Ro-landic fissure. (Keen and White.) 206 DISEASES AND INJURIES OF THE BRAIN. A convenient method of outlining the location of the central fissureis to mark the bregma, which lies vertically above the auditory meatus ;and to go 50 or 55 mm. below it and draw a line downwards and for-wards at an angle of 67 degrees. Chiene has devised a simple methodof obtaining an angle of 67^ degrees; this is sufficiently near to 67degrees. He takes a square of paper and folds it into two right-angletriangles, the smaller angles of these triangles must measure 45 de-grees, and half of one of these angles is 22 J degrees, which added to45 degrees equals 67J degrees. Fig. 82. 8 55 mm, AOE
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