70 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



(b) The connective-tissue cells may secrete a 

 homogeneous matrix, which later becomes striated, 

 producing fibers in a manner, as fibrin is formed in 

 clotting blood. 



Connective tissue is classified 

 according to its matrix into : 



i. Mucous Connective Tissue. 

 This consists largely of embry- 

 onic connective-tissue cells and 

 a jelly-like matrix or ground sub- 

 stance which gives a reaction for 

 mucus. It is found in the um- 

 bilical cord, where it is known as 

 Wharton's jelly, and in embry- 

 onic tissue. 



2. White Fibrous Connective Tissue. This consists 

 largely of white nonelastic fibers. The fibers are 

 parallel to each other, not branched, and yield gela- 



Fig. 36. Reticular 

 tissue from a lymph 

 gland. 



Tendon 

 cell. 



Fi g- 37- Teased tendon, showing Fig. 38. Cross section of tendon, 

 fine wavy white fibers. 



tin on boiling. The fibers swell up when treated with 

 acetic acid. They are found in tendons, the apo- 

 neuroses, and ligaments, the fascia of muscles, the 

 dura mater, and the fibrous capsules of many organs. 



