Operative surgery, for students and practitioners . gittalline, we will have indicated the position of the sulcus prscentralis. 70 HEAD AND FACE. This line may be called the linea prsecentralis. If the linea prificen-tralis is divided in thirds the location of the two sulci frontalis, superiorand inferior, will be indicated. If the meridional band is movedbackward so as to form an angle posteriorly with the sagittal lineof 60°, we will have the line called by Koeher the linea line marks the boundary between the gyrus angularis and gyrussupra-marginalis above and the occipital lob
Operative surgery, for students and practitioners . gittalline, we will have indicated the position of the sulcus prscentralis. 70 HEAD AND FACE. This line may be called the linea prsecentralis. If the linea prificen-tralis is divided in thirds the location of the two sulci frontalis, superiorand inferior, will be indicated. If the meridional band is movedbackward so as to form an angle posteriorly with the sagittal lineof 60°, we will have the line called by Koeher the linea line marks the boundary between the gyrus angularis and gyrussupra-marginalis above and the occipital lobe and temporo-sphenoidallobe below. The linea naso-lambdoidea is formed by moving themeridional band backward upon the sagittal band to a point 1 the lambdoid suture and bringing the lower free end of theband forward to the glabella. This shows the line of the Sylvianfissure, etc. OPERATIONS UPON THE HEAD. Improvement in operative technique and better understandmg ofthe functions of the different portions of the brain have had the effect. Fig. 45.—Doyen Perforator and Burr. The opening is made with perforatorand enlarged and completed with the burr. The burr pushes the dura materbefore it without Injurying it. of vastly improving the results obtained from operative interferencein affections of the brain, and give promise of still greater advancein this branch of surgery. In deciding to interfere in lesions ofthe skull and brain, the surgeon is often guided by the presence ofvery evident physical signs, such as depression of bone, etc.; at othertimes he must depend upon symptoms, general or focal, that pointto the presence of some intracranial lesion. Trephining.—By trephining we-mean, in a general way, makingan opening into, or resecting a portion of, the skull. This operationis done to relieve compression either from depressed bone or fromextravasated blood, and to treat intracranial conditions, as abscess,tumor, etc. The patient is placed upon the back with a th
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