. Quarterly journal of experimental physiology and cognate medical sciences. he first fewoperations. Next, the skin over the right temporal region was turned down andthe temporal muscle and pericranial fascia were carefully reflected fromthe underlying temporal bone, which was removed widely with a trephineand rongeur. The dura mater was opened with a triradiate incision, carebeing taken to avoid the vessels. The muscle flap was then loosely ExppriiiuMtal u ih*, rituilary 83 replaced tofjether with the overlying skin, and attention was turned tothe other side, from which the major portion oi t
. Quarterly journal of experimental physiology and cognate medical sciences. he first fewoperations. Next, the skin over the right temporal region was turned down andthe temporal muscle and pericranial fascia were carefully reflected fromthe underlying temporal bone, which was removed widely with a trephineand rongeur. The dura mater was opened with a triradiate incision, carebeing taken to avoid the vessels. The muscle flap was then loosely ExppriiiuMtal u ih*, rituilary 83 replaced tofjether with the overlying skin, and attention was turned tothe other side, from which the major portion oi the operation was con-ducted: in my experiments this was always on the left aide of the skin overlying the temporal region was raised on this side until thezygomatic arch was exposed. This structure was excised, together withthe overlying aponturosis, with a pair of Ixjne-cutting forceps. Next, thetemporal was retiected as on the right side, and the temporalbone widely removed with a trephine and rongeur (tig. 5). r)n this sid». Fig. 5.—Aiew of the field of operation at the stage wlien tlie bilateral openings havebeen made in the skull. (Drawing.) however, care was taken that the aperture made extended down as far aspossible to the base of the skull. If there was any bleeding from the boneon either side it was readily stopped with bone-wax. In fig. 6 is seen a skiagram of the skull of one of the animals takenduring life a few weeks after operation: the large aperture made on theleft side is %vell shown. A head-light was now required; and the next steps of the operationwere conducted by the operator single-handed, for it was tomanage the brain-retractor with one hand, while the manipulations inconnexion with the pituitary were carried out with the other. It will be 84 Blair Bell evident, therefore, that as no assistant is really required for the initial andlater stages, these operations can easily be performed without help. But,in order to expe
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