The practice of surgery . 636 OF THE SKULL 63- movements of the right hand. This is interesting, but less importantthan at hrst it was thought to be, for skulls vary so nuich that rulescannot be made to apply to them all. Moreover, in these days we areaccustomed to explore the brain through large windows in the skull, andto reach any given point by observing its relation to certain fixed andwell-knoAvn fissures and sulci in the brain itself. The student should befamiliar, however, with the recognized landmarks described by Broca:The pteriou is a point on the side of the skull, 1\ in
The practice of surgery . 636 OF THE SKULL 63- movements of the right hand. This is interesting, but less importantthan at hrst it was thought to be, for skulls vary so nuich that rulescannot be made to apply to them all. Moreover, in these days we areaccustomed to explore the brain through large windows in the skull, andto reach any given point by observing its relation to certain fixed andwell-knoAvn fissures and sulci in the brain itself. The student should befamiliar, however, with the recognized landmarks described by Broca:The pteriou is a point on the side of the skull, 1\ inches posteriorto the external angular process, on a level with the roof of the the pterion the middle meningeal artery is found passing inion is a point marked by the external occipital Fig. 414.—Diagram showing the various landmarks utilized as points of measure-ment in craniocerebral topography. Also, in red, main cerebral fissures and lobes ofthe exposed hemisphere (.Cushing in Keens Surgery). The glabella is the midpoint of the smooth swelling between the eye-brows. The bregma, placed at about the junction of the sagittal andcoronal sutures, is a point determined b} the intersection of two lines—(1) the line connecting the two external auditory meatuses, and (2)the line connecting the inion and the glabella. Figs. 411, 412, and 413.—Diagrams illustrating the more definitely locafized ofthe cortical centers of the exposed part of the hemisphere, in relation to the mainfissures and convolutions; also the word centers isensors and motor) involved inthe special mechanism for speech. (Receiving sensor^ stations in blue; dischargingmotor stations in red.) Drawn by accurate orthogonal projection of actual that centers for lower extremity are practi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsurgery, bookyear1910
