Volume 1
A textbook of pathology : systematic & practical.
- Hamilton, David James.
- Date:
- 1889-94
Licence: Public Domain Mark
Credit: A textbook of pathology : systematic & practical. Source: Wellcome Collection.
Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.
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![to get misplaced, and the direction of the incision, and, conseriueiitly, the parts exposed, will naturally vary. As these sections, moreover, run parallel with the fissure of Kolando, it is manifest that they cannot he perpendicular. Besides this, the cerebral peduncles are cut per- pendicularly or obliquely, whereas it will be admitted that a much better view of these is obtained when they are transversely incised. The first procedure which ought to be adopted in order to avoid these objections is to remove the pons, cerebellum, and medulla by a cross incision through the middle of the crura cerebri cutting straight back- wards into the substantia nigra and anterior corpora quadrigemina, and thus detaching the pons and medulla from the other portions of the brain. A ])rogressive series of transverse incisions is now carried throughout the pons and medulla each about one-eighth of an inch Fill. ■).—Peiu'endicular Transverse Section oe Human JJrain—Sect. I. thick. The segments should not be detached from the pia mater, if possible, but left connected and in sequence, so that they can be readily replaced. They may be employed for microscopic examination after- wards, for which [)iirpose longitudinal or obliipie sections are almost useless. As just said, unless the brain is fixed in one constant ])Osition, per- pendicular sections will always vary in what they sIioav. Even in the most accurately made sections of two brains the exposed parts are never always (juite alike, although the great landmarks may be the same in both. The method to ado])t in order to fix the organ in some definite position is to lay it, vertex downwards, with the tips of the oecipifal and frontol regions in one horhontal line. The organ should be placed upon a boartl, as it is easier t<j cut on this than on any other](https://iiif.wellcomecollection.org/image/b24990607_0001_0051.jp2/full/800%2C/0/default.jpg)
