. Some points in the surgery of the brain and its membranes . Fig. 147.—Diagram (natural size, and taken from the pieces of bone which wereremoved after they had been fitted together). The breaking away of the inner tableto a greater extent than the outer, and the close and even fitting of the fragments atthe lines of fracture is represented. The depression partly caused the locking of thefragments, as it was not abrupt, and any attempt at elevation only jammed themmore tightly together, hence the resort to the trephine. The foramen is for themiddle meningeal artery. OF TUMOUR OF THE BRAIN 285
. Some points in the surgery of the brain and its membranes . Fig. 147.—Diagram (natural size, and taken from the pieces of bone which wereremoved after they had been fitted together). The breaking away of the inner tableto a greater extent than the outer, and the close and even fitting of the fragments atthe lines of fracture is represented. The depression partly caused the locking of thefragments, as it was not abrupt, and any attempt at elevation only jammed themmore tightly together, hence the resort to the trephine. The foramen is for themiddle meningeal artery. OF TUMOUR OF THE BRAIN 285. Fig. 148.—Diagram (two-thirds natural size) to show the extent of brain, whichcan now be felt pulsating underneath the scalp. Part of the Sylvian fissure, andconvolutions and sulci of the frontal, parietal, and teniporo-sphenoidal lobes areexposed. The figures against the straight dotted lines indicate in inches the size ofthe opening. The curved dotted line separates the bone depressed by. the horse-kickfrom that removed with the trephine. x shows about the spot where the calkinor heel of the horseshoe drove a portion of skull into the brain ; * indicates theplace where a counter-opening was made in the dura mater and a catgut draininserted. 286 SOME POINTS IN THE SURGERY
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