Surgery (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 Excerpt: ... supposed to be occupied by centres of vision and hearing. XIII. The dotted line has been added to mark out the area, upon the inner surface of trie hemispheres, occupied by Horsley and Schafer's centres for the trunk and other muscles. C., at the base of the third fronial, marks the speech-centre. Where are the motor centres situated? These are found on both sides of, and above and below, the fissure of Rolando. Furthermore, they govern the muscles of the opposite side of the body. Hence paralysis or spasm of one or more groups of muscles on the right side of the body indicates cerebral Fig. 105. Diagram of Skull, showing lines of fissure of Rolando, middle meningeal artery, and cortical centres. compression on the corresponding centres of the left side of the brain. The number or extent of the muscles involved simply indicates a greater or less area of compression or number of centres compressed. But there is a limit to this idea. Thus, bilateral general convulsions or general paralysis do not necessarily mean that there is a clearly-defined compression on both sides and along the entire length of both fissures of Rolando. Such convulsions or paralysis might be the result of such a condition. but, being due to so many other causes as well, their presence is by no means an indication in themselves for operation. Diagram showing one method of locating the Fissure of Rolando (Nancrede). (For location of particular motor and other centres see Fig. 104; also Figs. 105 and 106). Give a method for determining on the skull the position of the fissure of Rolando. The upper end of the fissure is between 6J and 7j inches from the root of the nose. measured on a line taken straight back to the external occipital protuberance. The lower end.--Pass a tape circumferenti...