The human brain : histological and coarse methods of research : a manual for students and asylum medical officers / by W. Bevan Lewis.
- Lewis, William Bevan, 1847-1929.
- Date:
- 1882
Licence: Public Domain Mark
Credit: The human brain : histological and coarse methods of research : a manual for students and asylum medical officers / by W. Bevan Lewis. Source: Wellcome Collection.
Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.
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![THE DURA M.iTER AND VENOUS SINUSES. General Anatomical Features.—It is necessary here that the student should recall to mind certain anatomical details affecting the relationships of this membranous investment of the brain which have an important pathological significance, and in the first place note that:— 1. The dura mater is a fibro-serous membrane ; the outer surface being fibrous and rough, the inner being smooth and polished by a layer of epithelial cells constituting a parietal arachnoid. 2. Cut off a small portion and float it in water. The rough pilose outer surface due to the numerous fibrous connections and vessels Avhich unite it to the inner table of the skull becomes hereby very apparent in contrast to the smooth inner surface. 3. Next note that the dura mater is composed of kvo distinct layers, which, by their divergence, occasion the formation of the different venous sinuses ; whilst the inner layer, by its duplications, forms the various intra-cranial membranous partitions, the falx cerebri and cerebelli, as well as the tentorium. 4. Lastly, he must observe the close anatomical relation- ships between the lateral sinuses and the mastoid cells, and again between the superior petrosal sinuses and the internal ear. Caries of the petrous portion of the temporal bone and of its mastoid cells is so frequent an affection, that the con- tiguity to them of these venous sinuses is most important as ]>, 2](https://iiif.wellcomecollection.org/image/b21292966_0021.jp2/full/800%2C/0/default.jpg)
