. Comparative anatomy. Anatomy, Comparative. 152 COMPARATIVE ANATOMY resistance to tensile strain. The essential mechanical structures in such tissue are relatively coarse white fibers (Fig. 114) consisting of an albumi- noid substance, collagen, the source of gelatin and glue. These collagenous. Fig. 114.—Subcutaneous connecuve libsue from a cat. Highly magnified. The fibers were artificially separated and examined, unstained, in water, except the fiber marked "a" which was treated with dilute acetic acid, a, c, white fibers; b, fat cell; d, connective-tissue cell; e, elastic fibers
. Comparative anatomy. Anatomy, Comparative. 152 COMPARATIVE ANATOMY resistance to tensile strain. The essential mechanical structures in such tissue are relatively coarse white fibers (Fig. 114) consisting of an albumi- noid substance, collagen, the source of gelatin and glue. These collagenous. Fig. 114.—Subcutaneous connecuve libsue from a cat. Highly magnified. The fibers were artificially separated and examined, unstained, in water, except the fiber marked "a" which was treated with dilute acetic acid, a, c, white fibers; b, fat cell; d, connective-tissue cell; e, elastic fibers. (From Bremer, Text-book of Histology.) fibers are only slightly elastic. They may be branched. Each fiber is a bundle of very delicate fibrils. Exceedingly flattened cells with flat nuclei appear as if clinging closely to the surface of a fiber. These connective-tissue cells or fibrocytes are presumably the agencies which have brought about the production of the fiber. Elastic fibers (Fig. 114, e) are much finer than collagenous fibers and differ from them chemically in being composed of elastin which is not a source of gelatin. An occasional elongated fibrocyte may be seen stretching along the surface of a fiber (Fig. 115). Elastic fibers commonly occur intermingled with collagenous fibers. The elasticity of a connective tissue as a whole depends upon the relative abundance of elastic fibers in it. Connective tissue forming a loose open mesh-work, as does the subcutaneous tissue lying between the skin and the muscle of the body, is called areolar tissue. Reticular tissue is composed of cells whose branched processes join to form a network. Associated with the processes are compara- tively short fibers which seem to be similar to collagenous Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal,
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