. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. THE ARTICULATIONS IN GENERAL. 173 granular matter observed in the cells, it is not rare to find fat globules. The nuclei of the cells vary from ;|i5inT to -o^jts of an inch in diameter. The cells multiply endogenously.) The cartilage cells are insoluble in boiling water ; consequently, so far as their chemical composition is concerned, they are distinct from the fundamental sulistance. The diartlirodial cartilages have no vessels or nerves. The presence of cartilages of incrustation in the articulations is of th
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. THE ARTICULATIONS IN GENERAL. 173 granular matter observed in the cells, it is not rare to find fat globules. The nuclei of the cells vary from ;|i5inT to -o^jts of an inch in diameter. The cells multiply endogenously.) The cartilage cells are insoluble in boiling water ; consequently, so far as their chemical composition is concerned, they are distinct from the fundamental sulistance. The diartlirodial cartilages have no vessels or nerves. The presence of cartilages of incrustation in the articulations is of the greatest importance. When they are worn, absorbed, or transformed into bone in con- sequence of certain articular ujaladies, the movements become painful and very difficult. With regard to the part they play in the economy, it may be said that: 1. They favour, by their smoothness, the gliding and displacement of the bones. 2. They attenuate, by their suppleness and elasticity, the violent shocks to which the articulations are exposed. 8. They resist the wear and deformation of the articular surfaces. Complementary Fibro-cartilages.—There are two kinds of complementary fibro-cartilages. Some {interosseous) represent circular cushions which pad the margins of certain cavi- ties,finingupthenotches * Fig. 117. that might render these imperfect. They in- crease the depth of these cavities, and protect their borders from injury—for example, the coxo-femo- ral articulation. Others {inter-articular) are in- terposed between arti- cular surfaces when these do not exactly fit each other—as when two opposing extremities are convex. It may be remembered that the lateral tuberosities of each tibial surface present, for articulation with the condyles of the femur, two convex diarthrodial faces, the coaptation of which is rendered perfect by the interposition between each condyle and corresponding tibial surface, of a crescent-shaped fibro-cartilage, which for this reason has been nam
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