HEMOLYMPH NODES 



241 



In the splenolymph type, which is the more abundant, the node 

 is of small size and is well filled with secondary blood sinuses. The 

 lymphoid tissue is supported by a similar reticulum, and contains the 

 same varieties of lymph cells as in the lymph nodes. 



In the marrowlymph nodes a somewhat similar structure is found. 

 The blood sinuses are less numerous and lymph nodules do not occur 

 (Vincent, Warthin). The eosinophil leukocytes are more numerous 

 than in the splenolymph type, and the marrowlymph nodes as a rule are 

 the larger. 



Huntington (Amer. Jour. Anat., 16, 3, 1914) has suggested that 



FIG. 247. HORIZONTAL SECTION THROUGH THE FAUCIAL TONSIL OF A CHILD. 



Semi-diagrammatic, a, stratified epithelium; 6, crypts; c, lymph nodule; d, mucus- 

 secreting gland. Hematein and eosin. X about 20. 



some of the structures described as hemolymph nodes may be post-natal 

 hemopoietic foci, in which erythrocytes develop from the endothelium 

 of the lymph channels. They probably function as accessory spleens hav- 

 ing a combined lymphopoietic and phagocytic activity. 



Intermediate types between the lymph nodes and the splenolymph 

 type (Vincent, Jour. Anat. and Physiol., 1897) on the one hand, and be- 

 tween the splenolymph node and the spleen and marrowlymph type on 

 the other hand, are of frequent occurrence. 



Blood Supply. The afferent artery, according to Drummond (Jour. 

 Anat. and Physiol., 1900), enters the hilum with the connective tissue, 

 and through the trabeculae reaches all parts of the node. In the lymphoid 



