. Chordate anatomy. Chordata; Anatomy, Comparative. io6 CHORDATE ANATOMY 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 bone cell. 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. i Fig. 103.—Fat cells i
. Chordate anatomy. Chordata; Anatomy, Comparative. io6 CHORDATE ANATOMY 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 bone cell. 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. i Fig. 103.—Fat cells in subcutaneous tissue of a human embryo of four months. , blood-vessel; , white connective-tissue fibers; fib., young fibrocyte; mes., mesen- chymal cell; X, young fat cell, nucleus not in section; 1,2,3, developing fat cells. (From Bremer, "Text-book of ;) exceedingly thin layer surrounding the vacuole (Fig. 103). The flat nucleus lies in the peripheral layer of cytoplasm. The irregular poly- hedral form of the cells is doubtless the result of their mutual pressures. Blood The circulatory function of blood requires that it be fluid but various special services are rendered by cells suspended in the fluid, some of them passively carried by it, others capable of independent motion somewhat like that exhibited by an 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, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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