56 



PRACTICAL MICROSCOPY. 



CAETILAGE. 



Cartilage consists of a dense 'basis substance, in which, cells or chon 

 droblasts are imbeded. It presents in three forms. 



HYALINE CABTILAGE. 



The matrix of hyaline cartilage is transluscent, dense, and appar- 

 ently structureless. Minute channels in certain instances, and deli 

 cate fibrillae in others, have been demonstrated. 



Fia. 40. SECTION OF HYALINE CARTILAGE FROM A HUMAN BRONCHUS. 



The ground substance is apparently structureless, and it contains the membrane-lined exca- 

 vations in which one, two, three, or more cartilage cells appear. These cells show a well- 

 marked intra-cellular network, x 400. 



The basis material contains excavations, generally spherical, called 

 lacunce. They are lined with a delicate membrane and contain one, 

 two, three, and perhaps as many as eight cells the cartilage corpus- 

 cles. 



Hyaline cartilage is found covering joints generally, where it is 

 termed articular cartilage. It is also found in the trachea, the 

 bronchi, the septum narium, etc. 



Fig. 40 shows a section from one of the rings of a large bronchus. 



FIBRO-CARTILAGR. 



Fibrous connective tissue predominating largely in the basis sub- 

 stance, produces a structure of great strength fibro-cartilage. The 



