Histology of the Frog 



111 



istic wavy appearance; often they are united in bundles and run in all 

 directions. A few yellow elastic fibers may be scattered among the 

 white. These are always straight, however, and not wavy. If the tissue 

 should be treated with acetic acid, the white fibers swell up and disap- 



Outer circumferejh 



A. 



B. 



.- Haversian or con* 

 centric lamella. 



— Haversian canal. 



Interstitial lamella. 



Inner circumferen- 

 tial lamella. 



Fig. 40. 



A. Elastic cartilage. 



B. Haversian system with one lacuna sketched. 



C. Segment of transversely ground section from shaft of a long bone, showing 

 all lamellar systems. (From Bohm and Davidhoff.) 



pear. The yellow are not affected. The yellow fibers may also branch, 

 and when cut they do not curl as do the white fibers. In the various 

 spaces of the matrix ( ) connective tissue corpuscles 



or cells may also be found, varying in form and appearance, often united 

 with neighboring cells to form an irregular network, the meshes of which 

 are filled with intercellular substance. White fibrous tissue varies in 

 consistency and texture in different parts of the same animal. The loose 

 tissue which binds muscles together is known as areolar ( ), 



and is composed of sheets and strands intersecting each other in all 



