SYSTEMATIC SYNTHESIS OF TISSUES. 



179 



148, YELLOW SINEWY TISSUE is also very strong, 

 but it is likewise elastic ; its fibres do not lie parallel 

 to each other, but are branching, curled, and irregular. 

 It exists by itself in only a few places in the Body, but 

 in many it is mixed with the white. 



FIG. 142, FIG. 143, FIG. 142.1 



Fig. 142 represents two portions of highly magnified Yellow Tissue, 

 differing in size of fibres. 



Fig. 143 represents the same, around the air-cells of the Lungs. By 

 its action the air is expelled at each breath, and at each inhalation it must 

 be overcome by the internal pressure of the air. The perfection of breath- 

 ing, therefore, is chiefly dependent on this tissue. 



149. THE TWO TISSUES SEPARATE OR TOGETHER ARE 

 WROUGHT into many different forms or textures of 

 Ligaments, Tendons, Membranes, Fascia, Areolar Tex- 

 ture, etc. 



150. IN LIGAMENTS THE TISSUE is ARRANGED in 

 cords, bands, or caps, extending between' or around 

 parts that are fastened together, as in the case of the 

 bones. The fibres lie nearly parallel, or are braided to- 

 gether, as may be required. 



151. TENDONS ARE LIKE ligaments, except that at 

 one or both extremities they are attached to muscular 

 fibres, which makes a peculiar arrangement of the fibres 

 of the tendon necessary where they unite with the mus- 



148. What ? Describe Fig. 142. Describe Fig. 143. 149. How are ? 150. How 

 is? 151. What ? 



