THE SPLEEX 



161 



From the borders of the trabeculae, as well as from the inner 

 surface of the capsule, a delicate reticulum is continued into the 

 spleen pulp. This reticular tissue is similar in structure to that 



a 



a 



FIG. 156. FROM THE SPLEEN OF A CHILD. 



a, splenic pulp ; 6, Malpighiaa corpuscle ; c, capsule ; d, vascular trabeculas. Hematein 

 and eosin. Photo, x 28. 



of the lymphatic glands though consisting of rather coarser fibrous 

 bundles. Mall * states that the splenic reticulum is readily dis- 

 solved in acids and alkalis, but that, unlike that of lymphoid 

 tissue, it is also digested by pancreatin. The meshes of this retic- 

 ulum are occupied by the splenic cells. 



Splenic cells. Besides the endothelioid cells of the reticulum 

 and the epithelium of the small blood vessels, the following cell 

 types can be distinguished in the splenic pulp. 



1. Large mononuclear leucocytes. These are the most numer- 

 ous of the several cell types of the spleen. They possess a broad 

 rim of cytoplasm, and frequently exhibit karyokinetic figures. 



2. Small mononuclear leucocytes or lymphocytes, with a deeply 

 staining nucleus and narrow cytoplasmic rim. 



12 



* Johns Hop. Hosp. Bull., 1898. 



