TISSUES. 



75 



perichondrium, in which smaller blood-vessels ramify. 

 Blood- and lymph-vessels are absent from the carti- 

 lage matrix, except rarely and in places where active 

 growth or ossification is going on they may be present. 

 According to the structure of the matrix, cartilage is 

 classified as, 



Perichondrium. 



Cartilage cell. 

 Cartilage matrix. 



Fig. 42. Section of hyaline cartilage from the trachea. 



i. Hyaline Cartilage. This is the simplest and 

 most common form of cartilage. The matrix appears 



Cells. 



Lacuna 



A B 



Fig. 43. Two groups of cells from hyaline cartilage: A, Two 

 cells found just beneath the perichondrium; B, Four cells found deeper 

 in the cartilage matrix. 



to be a homogeneous substance, although many fine 

 interlacing fibrils are present. The lacunae near the 

 perichondrium have their long axis parallel to the 



