File:A treatise on nervous and mental diseases, for students and practitioners of medicine (1893) (14766155582).jpg

English:
"Photograph from Fraser, showing the cerebrum and the cerebellum in the cavity of the skull covered by the membranes; also the upper portion of the spinal cord."

Identifier: treatiseonnervou00gray (find matches)
Title: A treatise on nervous and mental diseases, for students and practitioners of medicine
Year: 1893 (1890s)
Authors: Gray, Landon Carter, 1850-1900
Subjects:
Publisher: Philadelphia, Lea
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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todefine very minutely the relation of a suture to the skull-bone, be-cause antiseptic surgery has rendered trephining nearly as harmlessan operation as circumcision, and in almost all cases the skull shouldbe so liberally removed as to lay bare a whole cerebral lobe or atleast several convolutions. The approximate relation, therefore, ofthe different cerebral fissures to the different sutures of the skull isall that it is necessary for the neurologist and the surgeon to know.Figs. 59 and 60, taken from Erasers beautiful atlas, will give a trueidea of the relative position of the main fissures and convolutions tothe skull, as the intra-cranial contents usually lie within the intra-cranial cavity. The fissures and convolutions can be readily identi-fied by comjjarison with Fig. 1. Various instruments have been ANATOMY. 79 devised for marking oif the skull, so-called cyrtometers, but anordinary tape line is as good as anything else. The rules followingwill be quite sufficient. Fig. 59.
Text Appearing After Image:
Photograph from Fraser, showing the cerebrum and the cerebellum in the cavity ofthe skull covered by the membranes; also the upper portion of the spinal cord. I. The longitudinal fissure corresponds with the median line ofthe vertex from the glabella, or junction of the nasal and frontalbones, to the inion, or occipital protuberance. II. To find tlie fi.ssure of Rolando: Measure the distance fromthe glabella to the inion, or occipital protuberance. Find 55.7 80 INTRODUCTORY. per cent, of this distance, and this will indicate the upper end of thefissure of Rolando, which is generally from 15.7 to 20.8 centimetresTo find the course of this fissure, mark off from from the glabella. Fig

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