86 



MAXTJAL OF HISTOLOGY. 



epiglottis, laryngeal cartilages, and the pinna of the ear (Fig. 

 The presence of elastic fibres is proved by their resistance 

 to boiling in acids and alkalies, and their failure to color with 

 carmine. Sections may be made with the knife and prepared 

 in almost any of the ways already mentioned. 



The appearances already described are not^een in the early 

 development of elastic tissue, but are easily identified in adult 



FIG. 34. Section of the boiled and dried auricle of the human ear : a, retiform cartilage ; ft, connec- 

 tive tissue. (Rollett) 



life. Even then the elastic fibrils may only be found in the in- 

 terior of the cartilage, while at the periphery the' matrix is 

 hyaline. Elastic cartilage is coated over with a delicate mem- 

 brane the perichondrium. 



Fibrous cartilage. This variety is also known as fibril - 

 lated or fibro-cartilage. The matrix has probably no elastic 

 fibrils, but is interspersed with connective- tissue bundles. It 

 is found in the cartilages which make the lips of the joints, the 

 inter-articular cartilages, the cartilaginous deposits in tendons, 

 the cartilage of the symphysis pubis and of glenoid fossae, and 

 possibly in the intervertebral ligaments and sesamoid carti- 

 lages. There is often more or less hyaline material about them. 

 In many instances the line of distinction between cartilage and 

 fibrous tissue is difficult to make out. Where, however, dis- 

 tinct corpuscles can be demonstrated, the tissue may properly 

 be regarded as cartilage. These bodies are similar to those 

 seen in hyaline and reticular cartilage. 



Division of the cartilage-corpuscle. A problem that has 



