. TREPANNING INSTRUMENTS. Trepanning.—This is an operation for opening into the bones of the head or face to elevate or raise a portion of bone which from accident has been depressed or frac- tured. The instrument used for this purpose is called a Trephine. It is designed to cut out a circular portion of the bone, so that a smooth piece of iron is inserted in tlia hole, and


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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthorses, bookyear1870