Quain's elements of anatomy . coats of theblood-vessels, especially the arteries, and conferring elasticity on thesetubes. MICROSCOPIC STRUCTURE OP CONNECTIVE TISSUE. The three kinds of connective tissue, the obvious characters andarrangement of which have just been described, agree closely Avith oneanother in elementary structure. They are all composed of a matrix orgTound-substance, in which cells are imbedded, and in this ground- 58 CONNECTIVE TISSUES. substance and between the cells are fibres of two kinds, the whiteand elastic. It is the different arrangement of the cells and fibres, aswe
Quain's elements of anatomy . coats of theblood-vessels, especially the arteries, and conferring elasticity on thesetubes. MICROSCOPIC STRUCTURE OP CONNECTIVE TISSUE. The three kinds of connective tissue, the obvious characters andarrangement of which have just been described, agree closely Avith oneanother in elementary structure. They are all composed of a matrix orgTound-substance, in which cells are imbedded, and in this ground- 58 CONNECTIVE TISSUES. substance and between the cells are fibres of two kinds, the whiteand elastic. It is the different arrangement of the cells and fibres, aswell as the relative proportion of one kind of fibre to the other, thatdetermines the different characters of the varieties of connective tissueabove enumerated. GroTind-sTilbstance and Fibres of Connective Tissue.—The-substance, matrix, or intercellular substance of the connective tissue is composed of a Fig- 55. soft homogeneous material „ -,„ ,^ ,„ „„__ I which occupies the tissue between the cells and cell-. )sS>ri> Fig. 55.—Cell-spaces op sub- CTTTANEOUS CONKEOTIVE-TISStJE,THE GROUND SDBSTANCE HAVINGBEEN STAINED DEEPLY BT NI-TRATE OP SILVER. (E. A. S.)3i0 DIAMETERS. groups, and in which, asabove stated, the fibrouselements of the tissue arefound, it may be in so great a quantity as altogether to obscm-e theground-substance in which they lie. It serves thus to unite the fibres,at least the white fibres, into the bundles which they form, penetratingbetween the individual fibrils of a bundle, and enveloping the latterwith a homogeneous sheath often of great tenuity. The ground-substance of connective tissue appears to contain mucin. Itis precipitated and rendered cloudy by acetic acid. It becomes stainedbrown when treated with nitrate of silver and afterwards exposed tothe hght, in this respect resembling the intercellular substance ofan epithelium. The cells of the tissue lie imbedded in it, either in Fig. 56.
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