48 



CONSCIOUS NERVOUS OPERATIONS 



(/?) APPENDIC'ULAH SKKLKTOX 



1. Shoulder Girdle, 4 



2. Upper Extremities, 60 



3. Pelvic Girdle, 2 



4. Lower Extremities, 60 



53. Cartilage. In infancy a considerable part of the 

 skeleton consists of cartilage, or gristle, which afterward 

 becomes ossified. But there are cartilages such as the 

 external ear, the rings around the windpipe, and the ends 

 of various bones which do not ossify, and are known as 

 permanent cartilages. Cartilage is a smooth white shining 

 tissue of close texture, rarely containing blood vessels. 

 It is made up, like the bones, of cells surrounded by the 

 intercellular substance which is the product of the living 

 cells. A thin layer of cartilage covers the surfaces of 

 the bones which come in contact with other bones. Car- 

 tilage also serves as padding in various parts of the body. 



54. Connective Tissues of different varieties serve to com- 

 plete the skeleton. They form the strong cords and bands 

 and sheets called ligaments, for binding bones together, 

 and the tendons which fasten the muscles to the bones. 



