SPLEEN. 1 :J9 



are the Malpighian corpuscles (Fig. 98). If the lymphoid 

 tissue is equally distributed around the artery, this vessel is 

 found in the centre of the Malpighian corpuscle. It may be 

 placed excentrically, on account of the unequal development of 

 this tissue. In sections of the spleen the Malpighian cor- 

 puscles are round structures with a diameter of 0.2-0.7 mm. 

 They are situated often at the place where an artery branches, 

 and each shows a germinal centre (Keimcentrum), in which 

 there is multiplication of the lymphocytes. 



FIG. 98. 



Capsult 



Malpiyhiw 

 corpwd 



Trabecuh 



: ; ;ll^;^c/:Pi 



^X ; ' : :-V /l '- 



Spleen pi*', 



Part of a section through the spleen of an ape. X (>0. 



The spleen pulp has the characteristic features of adenoid 

 tissue. It consists largely of lymphocytes, but contains also 

 large cells, with many nuclei containing red blood-corpuscles 

 and pigment. Nucleated and non-nucleated red corpuscles are 

 also found. 



The pigment granules which occur free or in leucocytes 

 are formed from broken-down red blood-corpuscles. The 



