Quain's elements of anatomy . d in a fibrous or columnar manner (Leidy). Itwas formerly held that the free surface of articular cartilage is coveredwith epithelium, but no such covering really exists. It is easy, nodoubt, to peel off a thin film from the surface of the cartilage of thehead of the humerus or femur; but this superficial layer is really partof the cartilage, and its broad patches of cells with the intermediatematrix are not to be mistaken (fig. 82). Near the margin of the articular cartilages connective tissue is pro-longed a certain way into them from the synovial membrane, and
Quain's elements of anatomy . d in a fibrous or columnar manner (Leidy). Itwas formerly held that the free surface of articular cartilage is coveredwith epithelium, but no such covering really exists. It is easy, nodoubt, to peel off a thin film from the surface of the cartilage of thehead of the humerus or femur; but this superficial layer is really partof the cartilage, and its broad patches of cells with the intermediatematrix are not to be mistaken (fig. 82). Near the margin of the articular cartilages connective tissue is pro-longed a certain way into them from the synovial membrane, and thecartilage-cells acquire processes and present transitions to the connective-tissue corpuscles of that membrane (fig. 88). The matrix of articular cartilage rarely, or perhaps never, becomesconverted into fibro-cartilage, nor is it prone to ossify like rib-cartilage. HYALINE CAETILAGE. Eut a deposit of calcareous granules may occur in the deeper parts ofthe articular cartilage near the bone, the deposit first showing itself. Pig_ S2.—A THIN LATER PEELED OFF FROJI THESURFACE OF THE CARTILAGE OF THE HEAD OPTHE HUMERUS, SHOWING FLATTENED GROUPS OP CELLS (Sharpey). Tlie slu-iinken cell-boclies are distinctly seen,lilt the limits of the capsular cavities where theyadjoin one another are but faintly 400 diameters. around the groups of cartilage cells (, d). This change may also happenat the symphyses. When the earthymatter is extracted by means of an acid,the tissue which remains has aU thecharacters of cartilage. In the costal cartilages, the cells, which are of considerable size, arealso collected in groups, larger for the most part than those found inarticular cartilage. Xear the exterior of the cartilage they are flattened,and lie parallel with the surface. As to those situated more inwardly,we can sometimes observe, in a transverse slice, that they form oblong-groups disposed in hues radiating to the circumference ; but thisarrangement is not consta
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