Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . KiG. ;i. -Wedge-shapkd Calvaria Removed by the Link uSAW-ruT Recommended. (See Text.) Il the posterior cut is so mafle. from the right and left sides, that ihrpoint just above the figure 7 will l>c the of a triangle, twosides of which are formed by posterolateral saw-cuts, there willbe no difficulty in retaining the wedge-shaped calvaria in plan- 24 TECHNIC. It is desirable to harden it in formaldehyde-water (formalin lo parts,water 90 parts) for several days before making an
Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . KiG. ;i. -Wedge-shapkd Calvaria Removed by the Link uSAW-ruT Recommended. (See Text.) Il the posterior cut is so mafle. from the right and left sides, that ihrpoint just above the figure 7 will l>c the of a triangle, twosides of which are formed by posterolateral saw-cuts, there willbe no difficulty in retaining the wedge-shaped calvaria in plan- 24 TECHNIC. It is desirable to harden it in formaldehyde-water (formalin lo parts,water 90 parts) for several days before making any incisions exceptthose through the margins of the corpus callosum into each lateralventricle, which are preliminary to all methods of dealing with thebrain, and are simply to promote hardening of its interior. If, how-ever, incisions are to be made at once, the pathologist should consider,in relation to any gross lesion present, the direction of tracts which. liHiiiilliihiilinlili Fig. 22.— on]y one is to be purchased, the lowest one will be of most use. mav be degenerated. Such tracts should be cut at right anglesto their course in order that the sections may be used for micro-scopic study. In this point of view the conventional methods of Vir-chow and of Pitres are objectionable. The safest single incision isDejerines horizontal cut passing through the cerebrum at a level slightlybeneath the upper surface of the callosum. This transects the basalganglia and the internal capsule at their widest parts, and will usuallyreveal anv gross lesion. If this is not conclusive, another section may Fig. 23.— for separating the brain from the spinal cord. The advantage claimed for this instriiment is the facilitywith which the cord may be cut transversely, thereby avoiding the objectionable oblique incision whichis usually secured when the ordinary knife is used for the same purpose. be made i cm. lower than the first and
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