1 78 HUMAN PHYSIOLOGY CHAP. 



enough to retain its shape, and elastic enough to spring 

 back when bent out of position. The ends of the nose 

 and the ears are examples of cartilage. 



Cartilage occurs in all places in the body where a cer- 

 tain amount of stiffness and firmness and at the same 

 time pliability and elasticity are required. Cartilage 

 serves many uses, such as to form the walls for certain 



I! 





FIG. 94. Cartilage, highly magnified (Buchholz). 



organs, as the larynx and trachea, to form enlargements 

 of the bones, to furnish a smooth surface at joints, to 

 deepen the socket for certain joints, to form cushions 

 between certain bones, and to form projecting organs 

 like the nose and ears. 



129. Joints. Wherever two bones come together 

 we have a joint. At some joints there is little or no 

 motion, while at others there is great freedom in both 

 the amount and the direction of the motion. At a joint 



