SPLEEN. 



365 



of the organ, so as to traverse the soft red spleen pulp. In these 

 trabeculae or prolongations from the capsule are found the 



FIG. 161. 



FIG. 162. 



(a) Trabeculse of the Spleen. (6) Artery cut obliquely. (Cadiat.) 



branches of the splenic artery, dividing into smaller twigs with- 

 out anastomosis. On leaving the trabeculse the arteries break up 

 suddenly into a brush-like series of small branches, ending in 

 capillaries which are lost in the 

 pulp where the small veins may 

 be seen to commence. 



Between the trabeculse are 

 found two distinct kinds of tissue : 

 (1) Rounded masses of lymphoid 

 tissue, which are here and there 

 scattered through the organ (Mal- 

 pighiau corpuscles) ; and (2) the 

 peculiar soft splenic pulp. 



The small rounded masses of 

 lymph follicular tissue are situated 

 on the course of the fine arterial 

 twigs. The delicate adenoid re- 

 ticulum which holds the lymph 

 cells together, is intimately con- 

 nected with the vessel wall. The pale appearance of these folli- 

 cles, which distinguishes them from the surrounding splenic pulp, 



Keticulum of the Spleen Pulp 

 injected with colorless gelatine. 

 (Cadiat.) (a) Meshes made of en- 

 dothelium. (b) Lacunar spaces, 

 through which the blood flows. 

 (c) Nuclei of endothelium. 



