. Medical and surgical therapy . point 1 centimetre abovethe lambda; this is the Sylvian line, which followsthe Sylvian fissure along nearly its whole extent. On this line 7 centimetres from the lambda will befound the g\rus angularis, and at 10 centimetres thegyrus supra-marginalis. The anterior end of theSylvian fissure can be located by erecting a perpen-dicular from the centre oi tlu- zygomatic arch untilit touclies the Sylvian line. This point also locatesthe head of the third frontal convolution. A point on the sagittal line approximately 1 or 2centimetres above the lambda corresponds to
. Medical and surgical therapy . point 1 centimetre abovethe lambda; this is the Sylvian line, which followsthe Sylvian fissure along nearly its whole extent. On this line 7 centimetres from the lambda will befound the g\rus angularis, and at 10 centimetres thegyrus supra-marginalis. The anterior end of theSylvian fissure can be located by erecting a perpen-dicular from the centre oi tlu- zygomatic arch untilit touclies the Sylvian line. This point also locatesthe head of the third frontal convolution. A point on the sagittal line approximately 1 or 2centimetres above the lambda corresponds to the 566 WOUNDS OF THE BRAIN upper end, on the convex edge of the hemisphere, ofthe external perpendicular fissure which divides theexternal aspect of the occipital lobe from the parietallobe ; the variations are fairly wide. A perpendicularto the sagittal line let drop from this point will givethe course of the external perpendicular fissure alongthe convexity of the hemisphere. These simple rules for locating the course of the. Fig. 4.—Radiographic projection of thfe cranial sutures and the cerebralfissures and sulci from a radiograph in a fixed position by M. seated, plate parallel to the sagittal plane, tube at 50 centi-metres (Pierre Marie, Foix, and Bertrand). principal fissures by means of a measuring tape willbe found amply sufficient, in practice, to locate thesite of a wound relatively to the princij^al fissures andthe principal centres of the cortex. The application of radiography to cranio-cerebral topo-graphy.—By means of radiography it is possible toascertain definitely the relation that the loss ofbone bears to the subjacent cerebral convolutions. We have made use of this method in the study of EXAMiyATIOy OF THE PATIENT 5C7 wounds of the visual area (see Chapter VIII.)- Thetechnique of this method has since been worked outin detail,^ and applied to the study of the fissuresand convolutions of the outer surface of the brain. Adescription of th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsurgery, bookyear1918
