File:Surgical anatomy - a treatise on human anatomy in its application to the practice of medicine and surgery (1901) (14782517922).jpg

Identifier: surgicalanatomyt02deav (find matches)
Title: Surgical anatomy : a treatise on human anatomy in its application to the practice of medicine and surgery
Year: 1901 (1900s)
Authors: Deaver, John B. (John Blair), 1855-1931
Subjects: Anatomy Surgery, Operative
Publisher: Philadelphia : Blakiston's
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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e the dura mater, sends processes into the longitudinal and trans-verse fissures, between the hemispheres of the cerebellum, and, to a slight extent,into the fissure of Sylvius. It also surrounds the nerves, forming tubular sheathsfor them as far as their points of exit from the skull. Unlike the pia mater,it does not dip into the sulci or fissures between the convolutions, but passesdirectly from one convolution to the other, bridging over the sulci. It forms aloose investment for the brain, and is continued downward over the spinal cord.Being a serous membrane, it presents to the naked eye a smooth, polished surface.It is connected by delicate connective tissue with both the dura mater and piamater, but much more intimately with the latter. The connection between the arachnoid and the pia mater makes the inde-pendent removal of the arachnoid very difficult. The arachnoid and pia mater PLATE CCLX, Posterior semicircular canal Scala media of cochlea Superior semicircular canalAmpullae
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Canalis reuniens UtricleDuctus endolymphaticus AmpullaExternal semicircular canal DIAGRAM OF MEMBRANOUS LABYRINTH.439 THE MEMBRANES AND VESSELS OF THE BRAIN. 441 can be separated, however, by inflating the subarachnoid space with air by meansof a blowpipe. The Subdural Space.—The araclmoid was formerly described as consisting oftwo layers—a parietal layer, lining the inner surface of the dura mater, and avisceral laj^er, reflected over the brain; in this respect it was said to resembleserous membranes elsewhere. It is now regarded as consisting of but one layer.The space between the dura mater and the arachnoid is known as the subduralspace, and contains a small amount of fluid; this space was formerly styled thecavit)^ of the arachnoid; it does not communicate with the subarachnoid space orwith the ventricles. The Subarachnoid Space.—The space between the arachnoid and the piamater is known as the subarachnoid space; it is most pronounced at the base ofthe brain. Here the arach

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