Elements of animal physiology, chiefly human . Vfhen a filament of connective tissue is treated with acetic acidits white fibrous tissue swells up enormously, entirely losing allcharacter of fibre, the yellow elastic fibres being visible underthe microscope as fine sharp lines in the middle of the swoUeumass. ADIPOSE TISSUE. 63 134. Yellow Fibrous Tissue consists of exceedinglyfine, sliarp, well-defined,microscopic, cylindric€il,flexible, extensible, elastic,fibres, about xoooo ^^ ^^inch in diameter. It is moreor less sparingly distri-buted tlirough connectivetissue, but it forms thebulk of ce
Elements of animal physiology, chiefly human . Vfhen a filament of connective tissue is treated with acetic acidits white fibrous tissue swells up enormously, entirely losing allcharacter of fibre, the yellow elastic fibres being visible underthe microscope as fine sharp lines in the middle of the swoUeumass. ADIPOSE TISSUE. 63 134. Yellow Fibrous Tissue consists of exceedinglyfine, sliarp, well-defined,microscopic, cylindric€il,flexible, extensible, elastic,fibres, about xoooo ^^ ^^inch in diameter. It is moreor less sparingly distri-buted tlirough connectivetissue, but it forms thebulk of certain elasticstructures, as the liga-menta subflava and thevocal cords. It is nearlyas elastic as iiulia does not yield gelatinewhen boiled, A variety of yelloioelastic tissue, the filamentsof which anastomose veryfreely with each other, andwhich forms the bulk ofthe middle coat of thelarger arteries, is known2i^ fenestrated membrane. When torn, its ends curl. Fig. 25. Yellow Elastic Tissue. Fibres fi-om the Ligamentft Subflava,some of -which branch off into smallercurling fibres, and some of which anastomosewith each other. Magnified 200 diameters. up, thus frequently, as when limbs are torn off bymachinery, retracting into, so as to plug up and stopthe torn ends of the arteries, so that little or no bloodis lost from them. 135. Adipose Tissue simply consists oi fat cells dis-tributed through the meshes of the connective tissue. Thefat cells, about -^-^ or ^ig- of an inch in diameter, con-sist of oval or globular cell-walls, formed of a fine,transparent, and structureless membrane, filled with ayellowish oily fluid. After death, when the animaltemperature falls, this oily fluid solidifies or coagulates,and becomes hard, as in the case of mutton suet. Adi-jjose tissue is more or less vascular, the cells being moreor less held together by the capillaries. 64 ANIMAL PHYSIOLOGY. Its chief uses are:—(1.) It serves as a store of heat-formingma
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