Surgery : its theory and practice / by William Johnson Walsham.

  • William Walsham
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: Surgery : its theory and practice / by William Johnson Walsham. Source: Wellcome Collection.

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    dry and sonorous -when struck, but often becomes brown or black when exposed to tbe air and the action of the discharges. Its free surface is smooth and even, or if pre- vioiisly inflamed, rough and irreguhii'; its margins are sen-ated and ragged ; and its previously attached surface is rough and uneven. It is heavj^ when sclerotic changes have occiu-red, light and porous when associated with caries. Process of separation.—When a jjortion of bone has become necrosed it acts as a foreign body and nature tries to cast it off. In some situations she is successful, in others she fails, and if not assisted by art the dead bone Fia. 48. —Syphilitic necrosis of the skull. (St. Bartholomew's Hosijital Museum.) may remain as a lifelong soiu-ce of irritation. The separa- tion of dead bono is best studied in superficial situations, as m the cranial bones (Fig. -IS), where its process can be watched. Here, say, from the breaking down of a syphilitic node [syphilUic periaditis), a portion of bone IS exposed and dies. This acting as an irritant causes the bone aroiuid to become infiamod (Fig. 47); rare- faction [ulceration) onsuos, and a round tlio dead portion is formed a gi'oovo, which gradually d(;epcns and extends beneath the dead part until the latter is completely cut off ' from the living, and if not removed bv art simidy comes away, or exjoliatcs as it is technically termed The cavity left becomes filled u]. with granulations, which
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