76 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



surface, while deeper in the matrix the long axis is 

 often at right angles to the surface. Each lacuna 

 contains one or more cartilage cells. The cartilage 



surrounding lacunae 

 usually stains differ- 



Cartilase cell. 



Elastic fibers. 



ance of the matrix. 



This cartilage oc- 

 curs as articular carti- 

 lage of joints, at the 

 end of ribs, and in the 

 nose, the larynx, the 

 Fig. 44. Section of elastic cartilage trachea, and bronchi. 



from epiglottis. 2 Elastic Carti . 



lage. Elastic cartilage differs from the hyaline vari- 



ety in having typical interlacing, branched elastic 



fibers that form a dense network. This cartilage is 



found wherever elas- 



ticity is required, as in 



the external ear, the 



Eustachian tube, epi- 



glottis, part of ary- 



tenoid cartilages, and 



cartilag'es of Wrisberg 



and Santorini. 



3. White Fibrous 

 Cartilage. In this va- 

 riety the white fibers 

 predominate. As a rule these fibers run parallel in 

 bundles and do not branch. A granular matrix 

 intervenes between the fibers. Fibrous cartilage 

 is found in the intervertebral disc, in the sym- 



Fig. 45 Section of white fibrocarti- 

 lage from symphysis pubis. 



