. Kirkes' handbook of physiology . e cell-substance, but even the nuclei,may disappear. The embryonic tissue, from which elastic fibers are developed,is composed of fusiform cells, and a structureless intercellular fusiform cells dwindle in size and eventually disappear so completelythat in mature elastic tissue hardly a trace of them is to be found: mean-while the elastic fibers steadily increase in size. ADIPOSE TISSUE 37 Adipose Tissue. In almost all regions of the human body a largeror smaller quantity of adipose or fatty tissue is present. Adipose tissue isalmost alwavs foun
. Kirkes' handbook of physiology . e cell-substance, but even the nuclei,may disappear. The embryonic tissue, from which elastic fibers are developed,is composed of fusiform cells, and a structureless intercellular fusiform cells dwindle in size and eventually disappear so completelythat in mature elastic tissue hardly a trace of them is to be found: mean-while the elastic fibers steadily increase in size. ADIPOSE TISSUE 37 Adipose Tissue. In almost all regions of the human body a largeror smaller quantity of adipose or fatty tissue is present. Adipose tissue isalmost alwavs found seated in areolar tissue, and forms in its meshes littlemasses of unequal size and irregular shape, to which the term lobules is com-monly applied. Structure. Adipose tissue consists essentially of cells which presentdark, sharply defined edges when viewed with transmitted light; eachconsisting of a structureless and colorless membrane or bag formed of theremains of the original protoplasm of the cell, filled with fat. A nucleus. Fig. 45.—A Lobule of DevelopingAdipose Tissue from an Eight-MonthsFetus, a, Spherical or, from pressure,polyhedral cells with large centralnucleus, surrounded by a finely reticrulated substance staining uniformlywith hematoxylin. b, Similar cellswith spaces from which the fat hasbeen removed bv oil of cloves, c. Sim-ilar cells showing how the nucleuswith enclosing protoplasm is beingpressed toward periphery, d. Nucleusof endothelium of investing capilla-ries. (McCarthy.) Drawn by Treves.
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