Carpenter's principles of human physiology . early equal proportion, thoughperhaps the elastic predominates ; whilstin the subcutaneous and submucousareolar tissue, the elastic fibres, thoughnumerous, form only a small part of thegeneral mass. When examined underthe microscope it is found to consisteither of separate fibres, of bundles of fibres, or of broad membranous bandsof a highly refractile and elastic substance. The fibres vary indefinitely insize, but have sharply-defined dark borders, and appear to be abruptly brokenoff at their extremities. They may anastomose and branch, and where t
Carpenter's principles of human physiology . early equal proportion, thoughperhaps the elastic predominates ; whilstin the subcutaneous and submucousareolar tissue, the elastic fibres, thoughnumerous, form only a small part of thegeneral mass. When examined underthe microscope it is found to consisteither of separate fibres, of bundles of fibres, or of broad membranous bandsof a highly refractile and elastic substance. The fibres vary indefinitely insize, but have sharply-defined dark borders, and appear to be abruptly brokenoff at their extremities. They may anastomose and branch, and where thefibres are broad and membraniform, and the anastomoses close, a thin tissueresults, as in the lining or fenestrated membrane of the arteries, which pre-sents a continuous sheet with only here and there minute holes or arrangement of its bloodvessels and nerves, which are very few innumber, is not accurately known. The fibres are reddened with Millonsreagent, and give the xanthoproteic reaction. They are not acted on by Fig. Yellow or Elastic Fibrous Tissue, fromligamentum nuchse. CONNECTIVE TISSUES—ADIPOSE TISSUE. 43 Fig. 29. acetic acid. When long boiled they yield a little modified gelatin. Elastictissue fulfils important functions in the vascular system—to which attentionwill hereafter be called—and it frequently occurs in situations where itsphysical properties enable muscular tissue to be dispensed with, as in theligamentum nuchaa of the larger quadrupeds. Occasionally, though morerarely, it appears as the antagonist of muscular effort, as in the chorda;vocales, and typically in the hinge of the shell in the Lamellibran chiata. 47. Adipose Tissue.—This form of tissue is extensively distributed throughthe animal kingdom, and consists of large cells filled with oil, which in goodspecimens are individually separated from one another, as well as collectedinto lobules by delicate trabecule of connective tissue (Fig. 29). It is morefreely supplied with
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