. The biology of the frog. Frogs. HISTOLOGY OF THE FROG 129 cells. The ligaments uniting the bones together are formed of a very dense and inelastic variety of white fibrous tissue. Modifications of the same kind of tissue occur in the cutis of the skin, in the-submucosa of the alimentary canal, in the substance of glands and the capsules surrounding various organs. Adipose tissue may be regarded as a form of connective tissue in which many of the cells have become enlarged through being gorged with fat; the nucleus with a small amount of protoplasm lies to one side of the cell, and the cell w
. The biology of the frog. Frogs. HISTOLOGY OF THE FROG 129 cells. The ligaments uniting the bones together are formed of a very dense and inelastic variety of white fibrous tissue. Modifications of the same kind of tissue occur in the cutis of the skin, in the-submucosa of the alimentary canal, in the substance of glands and the capsules surrounding various organs. Adipose tissue may be regarded as a form of connective tissue in which many of the cells have become enlarged through being gorged with fat; the nucleus with a small amount of protoplasm lies to one side of the cell, and the cell wall and a thin pel- licle of protoplasm sur- round the globule of fat. In its early stages the fat cell may contain several isolated droplets of oily substance which as they grow coalesce into a single large mass. Cartilage is a dense massive variety of con- nective tissue. In the clear hyaline cartilage which is the predominant variety in the frog, the matrix appears transparent and homogeneous, although under proper treatment it may be shown to contain numerous fibers which ordinarily are not evident. The cells are contained in rounded spaces or lacunae, scattered irregularly through the matrix; in some cases minute channels have been observed connecting the neighboring lacunae together. Two or more cells are often found in one lacuna, a fact which indicates that they have recently arisen by the division of the parent cell. Each cell causes the deposit around it of intercellular substance; and. Fig. 44.—Cartilage from the head of the femur, c, cells; c', cells in process of division; c. s, empty cell space ; m, matrix. (After Par- ker and Parker.). 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 Holmes, Samuel J. (Samuel Jackson), 1868-. New York : The Macmillan company
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