CH. V.] 



FIBRO-CARTILAGE. 



55 



fibrous membrane which surrounds the rod of cartilage, the cells 

 are flattened and lie parallel to the surface ; in the deeper parts 

 they are irregularly ar- 

 ranged ; they frequently 

 contain fat (see fig. 77). 



The hyaline cartilages 

 of the nose, larynx and 

 trachea (fig. 78) resemble 

 costal cartilage. 



Hyaline cartilage in 

 many situations (costal, 



, ,v F'S- 76. Vertical section of articular cartilage, 



laryilgeal, tracnealj Shows , cell-groups arranged parallel to surface 



a tendpnrv to bpromp &> cell -S rou P 8 irregularly arranged. f , cell 



ncv groups arranged perpendicularly to surface. 



calcified late in life. 



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

 called chondrin. This resembles gelatin very closely, and the 

 differences in its reactions are due to the fact that chondrin is 



^ \ < 



dog, showing fat-globules in the 

 cartilage-cells. (Cadiat.) 



p. 78. Ordinary hyaline cartilage from 

 trachea of a child. The cartilage 

 cells are enclosed singly or in pairs 

 in a capsule of hyaline substance, 

 x 150 aiams. (Klein and Noble 

 Smith.) 



not a chemical individual, but a mixture of gelatin with varying 

 aim units of mucin-like substances. 

 White Fibro- Cartilage occurs 



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

 lages of the knee-joint. 



2. A.s i- if -n/ii/' r> at ml or marginal cartilage, as on the edges of 

 the acctabulum and glenoid cavity. 



