Chap, v.] FIBROUS CONNECTIVE TISSUES. 33 



fibrous tissue, it is seen to swell up and to become 

 glassy-looking, homogeneous, and gelatinous. Sub- 

 jected to boiling in water, or to digestion by dilute 

 acids, the bundles of fibrous tissue yield collagen or 

 gelatin. 



37. According to the arrangement of the bundles, 

 the fibrous connective tissue varies in different locali- 

 ties. (1) In tendons and fasciae the bundles are 

 arranged parallel to one another. (2) In the true 

 skin and mucous, serous, and synovial membranes, in 

 the dura mater and tendon sheaths, the . trabeculse of 

 bundles divide repeatedly, cross and interlace very 

 intimately with one another, so that thereby a dense 

 felt-work is produced. (3) In the subcutaneous, sub- 

 mucous, or subserous tissue, in the intermuscular tissue, 

 in the tissue connecting with one another different 

 organs or the parts of the same organ i.e., interstitial 

 connective tissue the texture of the fibrous tissue is 

 more or less loose, the trabeculse dividing and re- 

 uniting and crossing one another, but leaving between 

 them larger or smaller spaces, cellulse or areolse, so 

 that the tissue assumes the character of a loose 

 plexus, which is sometimes called " areolar " or " cel- 

 lular tissue." Such tissue can be more or less easily 

 separated into larger or smaller lamellae, or plates of 

 trabeculse. (4) In the omentum and parts of the 

 pleura of man, ape, dog, cat, and some rodents, and 

 in the subarachnoidal tissue of the spinal cord and 

 brain, the trabeculse form a fenestrated membrane, with 

 larger or smaller oval or circular holes or fenestrse. 



38. The connective tissue cells or corpuscles 

 occurring in white fibrous tissue are of several varie- 

 ties, (a) In tendon and fascise the cells are called 

 tendon cells or tendon corpuscles; they are flattened 

 nucleated protoplasmic cells of a square or oblong 

 shape (Fig. 2 3 A), forming continuous rows (single files), 

 situated on the surface of groups of bundles of fibrous 



D 1 



