. The principles and practice of veterinary surgery . as already explaiaed. Pathology.—The, parts involved are the navicular bone, thebursal cartilage, the synovial membrane of the bursa, andthe tendon of the flexor pedis perforans. The inflammationis first limited to the cancelli of the bone, or the cartilage, asiQustrated by the following plates. The tendon passes under the bone, as a rope under a pulley,their surfaces being in a more complete co-adaptation from theeirciunstance of the bone having a process or eminence acrossits middle, to which the tendon is fitted by a correspondinghollow
. The principles and practice of veterinary surgery . as already explaiaed. Pathology.—The, parts involved are the navicular bone, thebursal cartilage, the synovial membrane of the bursa, andthe tendon of the flexor pedis perforans. The inflammationis first limited to the cancelli of the bone, or the cartilage, asiQustrated by the following plates. The tendon passes under the bone, as a rope under a pulley,their surfaces being in a more complete co-adaptation from theeirciunstance of the bone having a process or eminence acrossits middle, to which the tendon is fitted by a correspondinghollow in its substance. As a rule, it is the crest of thebone that shows the earliest signs of caries; whilst calcifica-tion of the cartilage is usually seen upon either side. Inflam-mation having been set up in the vascular cancellated structureof the bone, the progress of that inflammation may lead to a NAVICULAR DISEASE. 343 variety of changes, both within its interior and upon its bursalsurface; in one instance, to the deposition of smaU calcareous. Fig. 61 represents longitudinal sections of four navicular bones, their middle as near as possible. 1. Healthy bone. Cancelli in their natural condition, with distinctspaces (areolae) between the bony trabeculse. 2. Early stage of ostitis. The bone presents ahnost an ivoiy-likeappearance, from exiidation (and ossification of the exudate) into theareolar spaces, rendering the bone almost solid. 3. Second stage. Showing rarefaction of the bony tissue, and expan-sion of the areolae ; the inflammatory new formation has been absorbed ;the cancelli are enlarged, and cavities are formed (indicated by the darkspots) by absorption of the bony trabecute. The exterior of this boneshows no signs of disease. 4. In this figure both the processes, viz., consolidation and rarefaction,are going on. In the centre and to the left hand, dark spots (foramina)are seen, indicating the destructive (rarefactive) process; whilst to the right,and
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectveterin, bookyear1904
