MICROSCOPICAL DIAGNOSIS. 



73 



TYPE OF NERVOUS TISSUE. 



Neuroma. These consist of true nerve fibres and are not the 

 growths so commonly met with growing from the sheath of nerves 

 or within the sheath. They are composed of ordinary medullated 

 nerve fibres associated with connective tissue. They are found on 

 the ends of divided nerves, growing after amputations. They are 

 usually very small nodules, innocent, and are remarkable largely for 

 the great pain they cause. 



TYPE OF BLOOD-VESSELS. 



Angioma. These tumors are composed of blood-vessels held 

 together by connective tissue. The diagnosis is readily made with- 

 out the aid of the microscope. 



fig. 24. Papilloma. 



TYPE OF PAPILLA. 



Papilloma, papillary or villous tumor. This tumor consists of a 

 body of connective tissue with a covering of epithelial cells, re- 

 sembling the papillae of the skin. They are rarely without blood- 

 vessels, which end either in a capillary net-work or in a single loop. 

 Cells may be seen scattered through the connective-tissue basis. 

 The epithelial covering is generally like that from which the part 

 arises. The papillomata may occur on any surface of the body, but 

 more generally where papillae and villi normally exist. They occur 



