38 



THE CONNECTIVE TISSUES 



[CH. V. 



Hyaline Cartilage is found in the following places : 



1. Covering the articular ends of bones ; here it is called articular 

 cartilage (fig. 50). 



2. Forming the rib-cartilages ; here it is called costal cartilage. 



3. The cartilages of the nose, of the windpipe, of the external 

 auditory meatus, and the greater number of the laryngeal cartilages. 



4. Temporary cartilage: rods of cartilage which prefigure the 

 majority of the bones in process of development. 



Hyaline cartilage in many situations (costal, laryngeal, tracheal) 

 shows a tendency to become calcified late in life. 



On boiling, the ground-substance of cartilage yields a material 

 called chondrin. This resembles gelatin very closely, and the differ- 

 ences in its reactions are due to the fact that chondrin is not a 

 chemical individual, but a mixture of gelatin with varying amounts 

 of mucoid substances. 



White Pibro-Cartilage occurs 



1. As inter-articular fibro-cartilage e.g., the semilunar cartilages 

 of the knee-joint. 



2. As circumferential or marginal cartilage, as on the edges of the 

 acetabulum and glenoid cavity. 



3. As connecting cartilage e.g., the inter- vertebral discs. 



SSI . Cells of car- 

 tilage. 



.... Fibrous 

 matrix. 



FIG. 51. White fibro-cartilage. (Cadiat.) 



FIG. 52. Yellow or elastic fibro-cartilage. 

 (Cadiat.) 



White fibro-cartilage (fig. 51) is composed of cells and a matrix. 

 The latter is permeated by fibres of the white variety. 



In this kind of fibro-cartilage it is not unusual to find portions so 



