128 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



center. The space occupied by these white corpus- 

 cles is called the lymph sinus. The cells of the sinus 

 are in circulation while those of the germ center 

 remain stationary. 



Lymph glands represent adenoid tissue and con- 

 sist of two elements, (a) reticular connective tissue, 

 with many elastic fibers, and (fc) lymphoid cells. An 

 inflammation of this tissue is therefore called adeni- 

 tis. Blood-vessels and nerves ramify through this 

 tissue. They enter at one point called the hilum. 

 Lymph vessels connect with opposite points of the 

 node, the efferent one passing out at the hilum. The 



Fig. 92. A small lobule from the thymus of child, with well- 

 developed cortex, presenting a structure similar to that of the cortex 

 of a lymph gland (Bohm and Davidoff). 



efferent quickly unites with a second node to which it 

 becomes the afferent vessel. In this way the lymph 

 nodes are united into chains, always accompanying 

 blood-vessels and fascia. 



Solitary lymph nodes are found just beneath the 

 epithelium of mucous membranes, particularly in 

 the alimentary tract. They resemble secondary 

 nodules of lymph nodes. In the lower part of the 



