186 



THE ORGANS 



and exit of the large splenic vessels. Accompanying the vessels 

 broad strands of capsular tissue extend deep into the organ where 

 they radiate and subdivide, to form with smaller trabecular which 

 extend in from other parts of the capsule, the connective-tissue frame- 

 work of the organ (Fig. 109). 



The chambers incompletely bounded by the connective-tissue 

 septa are filled in with tissue resembling lymphatic tissue, composed 

 of reticular connective tissue, lymphoid cells, and other varieties of 

 cells described on p. 188. This tissue constitutes the substantia 

 propria of the organ and is everywhere traversed by thin-walled 

 vascular channels, the tissue and vascular channels together con- 







o /a~ ' o o "" 



Fig. 1 10. — Section of Human Spleen, including portion of Malpighian body with its 

 artery and adjacent splenic pulp. X300. (Technic 2, p. 191.) o, INIalpighian body; 

 h, pulp cords, c, cavernous veins; h and c together constituting the splenic pulp. 



stituting the splenic pulp (Fig. no). Compact lymphatic tissue 

 occurs in the spleen as spherical, oval, or cyHndrical aggregations 

 of closely packed lymphoid cells. These are known as Malpighian 

 bodies or splenic corpuscles (Figs. log and no) and are distributed 

 throughout the splenic pulp. Each splenic corpuscle contains one 

 or more small arteries. These usually run near the periphery of 

 the corpuscle; more rarely they lie at the centre. Except for its 

 relation to the blood-vessels, the splenic corpuscle is quite similar in a 

 structure to the lymph nodule. It consists of lymphoid cells so closely 

 packed as completely to obscure the underlying reticulum. In a 

 child's spleen the centre of each corpuscle shows a distinct germinal 



