( 196 ) 



CARTILAGINOUS SYSTEM. 



Q. How is this divided? 



#. Into the cartilaginous and nbro-cartilaginous tissues. 

 Q. What do you mean by cartilage? 

 ft. It is a substance characterized by hardness, white- 

 ness, elasticity, apparently but not actually inorganic, 



Forms of the Cartilaginous System. 



Q. What are the three classes of cartilages? 



A. Those at the ends of the moveable bones, those at 

 the union of the immoveable bones, -those on the parietes 

 of cavities, as the ribs and nose. 



Q. What utility results from cartilages at the moveable 

 joints? 



ft. By the properties of suppleness, elasticity, and 

 yielding, they increase the facility and extent of the mo- 

 tions of the joints, while they break by yielding a little, 

 the violence of the shocks the limbs experience. 



Q. Is the nutritive parenchyma of the bone continued 

 into the cartilage ? 



*ft. No; they are different, or rather distinct. 



Q. Why are the cartilages at the ends of the moveable 

 joints more polished and shining than those elsewhere? 



./?. The extension of the synovial membrane over those 

 joints communicates that shining appearance. 



Q. Do you recollect any instances of cartilages in the 

 immoveable articulations? 



