. Minor and operative surgery, including bandaging . 558 EXCISIONS OB RESECTIONS. be enlarged to obtain greater exposure of the membranesor bxain, it may be done very satisfactorily with a formof rongeur forceps. A portion of the skull may also be removed by the useof the gouge and mallet; the gouge is generally preferredto the trephine in opening the mastoid cells. Fig. 1. Trephine opening for mastoid antrum. 2. For abscess from otitis To expose cerebellum. 4, 5. For middle meningeal hemorrhage. A. Lateralsinus. B and C. Limit of up and down variation. (Stimson.) When the treph


. Minor and operative surgery, including bandaging . 558 EXCISIONS OB RESECTIONS. be enlarged to obtain greater exposure of the membranesor bxain, it may be done very satisfactorily with a formof rongeur forceps. A portion of the skull may also be removed by the useof the gouge and mallet; the gouge is generally preferredto the trephine in opening the mastoid cells. Fig. 1. Trephine opening for mastoid antrum. 2. For abscess from otitis To expose cerebellum. 4, 5. For middle meningeal hemorrhage. A. Lateralsinus. B and C. Limit of up and down variation. (Stimson.) When the trephine is applied to expose the seat of hem-orrhage from the middle meningeal artery, or hemorrhagefrom the lateral sinus, or an abscess from middle-ear dis-ease, or to open the mastoid antrum, the positions for theapplication of the trephine are indicated in Fig. 470. TREPHINING THE ANTRUM OF HIGHMORE. 559 Osteoplastic Resection of the Skull.—In this opera-tion for exposing the membranes of the brain, a portionof the skull having the soft parts attached is turnedaside, so that it may subsequently be replaced and suturedin its original position. The operation is frequentlyemployed to expose the ganglia at the base of the brainand in the removal of tumors of the brain. A horseshoe-shaped incision is made, and the edges are allowed to retract(Fig. 471). A groove is next c


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