188 



THE ESSENTIALS OF HISTOLOGY. 



into masses which envelop the smaller arteries, whilst the red pulp 

 which everywhere surrounds them and which forms the bulk of the 

 organ is composed of a close network or sponge work of flattened and 



FIG. 220. VERTICAL SECTION OF A SMALL SUPERFICIAL PORTION OF THE HUMAN 



SPLEEN, AS SEEN WITH A LOW POWER. (Kolliker.) 



A, peritoneal and fibrous covering ; b, trabeculse ; c, c, Malpighian corpuscles, in one of -which 

 an artery is seen cut transversely, in the other longitudinally ; d, injected arterial twigs ; 

 e, spleen-pulp. 



u. 



FIG. 221. THIN SECTION OF SPLEEN-PULP, HIGHLY MAGNIFIED, SHOWING THE 

 MODE OF ORIGIN OF A SMALL VEIN IN THE INTERSTICES OF THE PULP. 



v, the vein, filled with blood-corpuscles, which are in continuity with others, bl, filling up the 

 interstices of the retiform tissue of the pulp ; -w, wall of the vein. The shaded bodies 

 amongst the red blood-corpuscles are pale corpuscles. 



branched cells like connective-tissue corpuscles. Coursing through the 

 pulp and communicating with its interstices are capillary blood-vessels 

 which are connected with the terminations of the arteries ; whilst in 

 other parts venous channels arise from the pulp, and bring the blood 



