. The chordates. Chordata. Histology 327. Fig. 269. Fat-cells in subcutaneous tissue of a human embryo of four months, () Blood-vessel; () white connective-tissue fibers; (fib.) young fibrocyte; (mes.) mesenchymal cell; (x) young fat-cell, nucleus not in section; (1, 2, 3) de- veloping fat-cells. (Courtesy, Bremer: "Text-Book of Histology," Philadelphia, The Blakiston Company.) cartilage and bone lies in the fact that the cartilage-cell produces matrix in all directions and thus surrounds itself by its own product, whereas the osteoblast produces matrix only at such part of
. The chordates. Chordata. Histology 327. Fig. 269. Fat-cells in subcutaneous tissue of a human embryo of four months, () Blood-vessel; () white connective-tissue fibers; (fib.) young fibrocyte; (mes.) mesenchymal cell; (x) young fat-cell, nucleus not in section; (1, 2, 3) de- veloping fat-cells. (Courtesy, Bremer: "Text-Book of Histology," Philadelphia, The Blakiston Company.) cartilage and bone lies in the fact that the cartilage-cell produces matrix in all directions and thus surrounds itself by its own product, whereas the osteoblast produces matrix only at such part of its surface as is adjacent to the already formed bone. A layer of bone cells build- ing up lamella upon lamella of bone may be likened to a group of masons laying course upon course of stone at the unfinished top of a wall. But, in the case of the bone, every now and then one of the masons, an osteoblast, is left behind and buried between successive courses of the wall, remaining there in his little lacuna as a permanent and living bone-cell. Bone once formed may be broken down or "; By this means, the marrow cavity of a long bone is enlarged as the bone grows. The resorption is attributed to the action of special cells called "; ADIPOSE TISSUE Adipose tissue or "fat" consists of cells each of which contains a globule or vacuole of oil so large that the cytoplasm appears as merely an exceedingly thin layer surrounding the vacuole (Fig. 269). The flat. 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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