368 



MANUAL OF PHYSIOLOGY. 



as to traverse the soft, red spleen pulp. In these trabeculse or 

 prolongations from the capsule are found the branches of the 

 splenic artery, dividing into smaller twigs without anastomosis. 

 On leaving the trabeculse the arteries break up suddenly into a 

 brush-like series of small branches, ending in capillaries which 



FIG. 158. 



FIG. 159. 



FIG. 158. Portion of Thynnis removed from its envelope and unraveled so as to show 

 the lobules (6, b) attached to a central band of connective tissue (a). 



FIG. 159. Magnified section of a portion of injected Thymus, showing one complete 

 lobule with soft central part (cavity) (6), and parts of other lobules. (Cadiat.) (a) Lym- 

 phoid tissue, (c) Blood vessels, (d) Fibrous tissue. 



FIG. 160. Elements of Thymus (high power). (Cadiat.) (a) Lymph corpuscles, (b) 

 Epitheloid nests of Hassall. 



are lost in the pulp where the small veins may be seen to com- 

 mence. 



Between the trabeculse are found two distinct kinds of tissue: 

 (1) Rounded masses of lymphoid tissue, which are here and 



