394 



HISTOLOGY OF THE MORBID PROCESSES. 



scales from which accumulate in the cavity of the tumor, where 

 they may be mixed with sebum (wens). 



5. Glioma. The neuroglia, originally of epithelial origin from 



FIG. 363. 



Gliomata of the brain. (Stroebe.) Mixed type, containing cells like those in Fig. 362, but 

 also large branching cells simulating ganglion-cells, "glioma gangliocellulare." 



In sections of gliomata stained by the methods in more general use the delicate processes are 

 often not visible, but the nuclei are prominent. The tumor, therefore, appears highly 

 cellular with a finely granular material (the unstained processes) between the cells. 



the ectoderm, may proliferate to form tumors, called gliomata. 

 These diifer in their structure according to the variations in type 

 presented by the glia-cells composing them (Figs. 362 and 363). 



V. PAPILLOMATA. 



Before leaving the subject of tumors it will be necessary to 

 devote a few words to the consideration of growths that cannot be 

 considered as primarily arising from either epithelium or connective 

 tissues. The papillomata are examples of such growths. These 

 are over-developments of papillary structures normally present, or 

 spring from mucous surfaces where such structures are normally 

 either not present or are but poorly developed. 



