Une introduction à l'étude de l'anatomie comparative des animaux . il sujet. La substance populairement connue sous le nom de griste, mais le cartilage scientifique, a de nombreuses caractéristiques communes avec le tissu de connexion. Comme ce dernier, il se compose d'une homogenésmatrice dans laquelle les cellules sont intégrées. Si une fine tranche de cartilage blanc ou pantôt et translucide de l'articulation d'un os ou de l'hyoïde, sternum, Ou supra-scapula d'une grenouille à examiner au microscope, on voit qu'elle consiste à être numérisée par l'ANATOMIE COMPARATIVE de Microsoft® des cellules nucléées intégrées dans une matrice de gelat ferme

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An introduction to the study of the comparative anatomy of animals . he subject. The substance popularly known as gristle, but scientificallynamed cartilage, has many features in common with connec-tive tissue. Like the latter, it consists of a homogeneousmatrix in which cells are imbedded. If a thin slice of thewhite or pearly and translucent cartilage from the articularhead of a bone or from the hyoid, sternum, or supra-scapula ofa frog be examined under the microscope, it is seen to consist Digitized by Microsoft® I02 COMPARATIVE ANATOMY of nucleated cells imbedded in a matrix of firm gelatinousconsistency, which can easily be cut with a knife, but is at thesame time highly elastic; it may be bent, twisted, or com-pressed, but readily recovers its size and shape when freedfrom the stress to which it was subjected. Like the inter-cellular substance of connective tissue, the matrix of cartilageis readily stained by nitrate of silver. There are several kinds of cartilage, hyaline, calcified, andfibrous cartilage; the last-named may be yellow or white, . Fig. 20. Part of a section through the xiphisternum of a frog to show the structure ofhyaline cartilage. Several cartilage cells, many of them in groups oftwo, are imbedded in a hyaline matrix. according as the fibres in it are elastic or simply white fibres.We will concern ourselves chiefly with hyaline cartilage, so-called because of its homogeneous translucent matrix. Thecells imbedded in it are rarely disposed singly and at equaldistances from one another, but usually in groups or lines oftwo, four, or more, and it is often noticeable that in a groupof two the cells are separated by a very small amount of inter-vening matrix, and that their adjacent sides are flattened asif by mutual pressure. Each cartilage cell is a subsphericalor lenticular corpuscle of protoplasm, containing a roundednucleus with a well-defined chromatin network, and a cell-body, in which fine granules and interlacing fibrils may often Digiti

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