General surgery and pathology for dentists . nd become pus cells,whilst those in the deeper parts, with the coagulated plasma bywhich they are held together, become converted into fibroustissue. This newly formed tissue shrinks, causing stillfurther diminution in the size of the cavity. The granulations-go on growing and becoming gradually converted into fibroustissue until the cavity is quite filled up, and its former siteoccupied by a scar which becomes covered over by epithe-lium derived from the neighbouring skin or mucous mem-brane. The more the neighbouring parts will allow the newfibrou
General surgery and pathology for dentists . nd become pus cells,whilst those in the deeper parts, with the coagulated plasma bywhich they are held together, become converted into fibroustissue. This newly formed tissue shrinks, causing stillfurther diminution in the size of the cavity. The granulations-go on growing and becoming gradually converted into fibroustissue until the cavity is quite filled up, and its former siteoccupied by a scar which becomes covered over by epithe-lium derived from the neighbouring skin or mucous mem-brane. The more the neighbouring parts will allow the newfibrous tissue to contract, the quicker the process of repair is;,thus in abscess of bone the healing is slow as the cavity has 14 PATHOLOGY AND SURGERY, to be entirely filled by the granulating process, no shrinkingbeing possible. Sometimes an abscess does not heal com-pletely, but contracts into a narrow suppurating track calleda -fistula or sinus. The walls of a sinus are usuallythickened by fibrous tissue and lined by ill-formed granula- Oq 0. Fig, sketch of the healing of an abscess. The inflammatorycells have arrranged^themselves into granulations, each containing acapillary loop. Pus cells are being exuded into the abscess cavity andfibrous tissue is being formed outside the wall. tions, and the orifice is usually surmounted by a crop ofprotruberant granulations. The degeneration of an abscessinto a sinus is usually due to some foreign body snch as apiece of dead bone or the root of a carious tooth, keeping upthe irritation. PATHOLOGY AND SURGERY. 15 ULCERATION. Ulceration is essentially the same process as both there is molecular death and disintegration oftissue following upon, and due to inflammation, and death ofthe exuded leucocytes and proliferated tissue-cells producingpus. In an ulcer the process takes place on the surface ofskin or mucous membrane. An ulcer may be said to be anopen abscess, and conversely an abscess may be said to be ac
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