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

  • William Walsham
Date:
1887
Catalogue details

Licence: Public Domain Mark

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

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    tiibercle-iiodiilc, thouo-li sometiuies seated upon a, suiall vessel, is itself _comj_)letcdy^ non-vascular^ The origin of the celliTis still a matter oFdisputo Hlic Ij-mphoid cells are generally thought to be leucocytes, the epithelioid cells. to be derived either from the lymphoid cells or the lymphatic endothelium, and the giant-cells to be derived from either of the other two. Although this may be regarded as the typical microscopical appearance of _a mfliary tubercle, often neither giant-cells nor -epithelioid cells are present, whilst both these may be found m chronic inflammations which are not tubercular. There is therefore no histological element which can be said to ■piG. 4. Diagram of the iiiiuule structure of tubevclc. he distinctivo of tubercle. The only rolialde character- istic, according to recent authorities, is the presence of the tubercle h'aciUus. This micro-organism is a rod-liko body, nsuallv straight, somctiines curved, rounded at^its cn.ls, and al)out oiio-liftli its length m breadth Alter- nating with the stained portions, arc seen bright spots, which are gcnerallv believed to bo spores, iho bucilla arc found both in the cells. es]>ecially those of the giant f(OTn, and in the intercellular substance. _ , , , 8ero>u/arv chuu;/,:,.-TnhovvXo appears^ incapable of higher de^cdopment, but is very liable to retrogressive chaii'-cs. Thus the grov granulations may undcrgojiittj:
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