. Kirkes' handbook of physiology . Fig. 49.—Costal Cartilage from an Adult Dog. showing the Fat-Globules in the Cartilage Cells. (Cadiat.) surface of the mass of cartilage, and more or less perpendicular to the surfacein the more deeply seated portions. The intercellular substance of hyaline cartilage, when viewed fresh orafter ordinary fixation, appears homogeneous. However, when subjectedto special methods, the seemingly homogeneous intercellular substance can 40 CELL DIFFERENTIATION AND THE ELEMENTARY TISSUES be shown to be made up of fibers, comparable with those found in whitefibrous tiss
. Kirkes' handbook of physiology . Fig. 49.—Costal Cartilage from an Adult Dog. showing the Fat-Globules in the Cartilage Cells. (Cadiat.) surface of the mass of cartilage, and more or less perpendicular to the surfacein the more deeply seated portions. The intercellular substance of hyaline cartilage, when viewed fresh orafter ordinary fixation, appears homogeneous. However, when subjectedto special methods, the seemingly homogeneous intercellular substance can 40 CELL DIFFERENTIATION AND THE ELEMENTARY TISSUES be shown to be made up of fibers, comparable with those found in whitefibrous tissue, embedded in the homogeneous matrix. In the hyaline cartilage of the ribs the cells are mostly larger than inthe articular variety and there is a tendency to the development of fibers. Fig. 50.—Yellow Elastic Cartilage of the Ear. Highly magnified. (Hertwig.) in the matrix, figure 49. The costal cartilages also frequently become calcifiedin old age, as also do some of those of the larynx. In the fetus cartilage is the material of which the bones are first con-structed; the model of each bone being laid down, so to speak, in this aiuiilMld ! 1 BfcliJii-ifi ? •?i,ffe>/. Fig. 51.—White Fibro-Cartilage. (Cadiat.) substance. In such cases the cartilage is termed temporary. It closelyresembles the ordinary hyaline cartilage but the cells are more uniformlydistributed throughout the matrix. BONE 41 Elastic and White Fibro-Cartilage. The first variety is found inthe cartilage of the external ear; the latter in portions of the joints, the inter-vertebral cartilages, etc. Structure. Elastic and white fibro-cartilage are composed of cells and amatrix; the latter being made up almost entirely of fibers closely resemblingthose of fibrous connective tissue. Developme
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