316 



LYMPH AND LYMPHATIC GLANDS 



[CH. XXII. 



and an inner or medullary portion of redder appearance (figs. 304, 

 305). In the outer part, or cortex, of the gland (fig. 305), the 

 intervals between the trabeculse are large and regular; they are 

 termed alveoli; whilst in the more central or medullary part is a 

 finer meshwork formed by an irregular anastomosis of the trabecular 

 processes. Within the alveoli of the cortex and in the meshwork 

 formed by the trabeculte in the medulla, is contained lymphoid 

 tissue; this occupies the central part of each alveolus; but at the 

 periphery, surrounding the central portion and immediately next the 

 capsule and trabeculae, is a more open meshwork of retiform tissue 



<r 



\ 



ir. 



FIG. 305. Diagrammatic section of lymphatic gland, a.l., afferent; e.L, efferent lymphatics; C, 

 cortical substance ; l.h., lymphoid tissue ; l.s., lymph-path ; c., fibrous capsule sending in trabeculae 

 tr. into the substance of the gland. (Sharpey.) 



constituting the lymph-path, and containing but few lymph-corpuscles. 

 At the inner part of the alveolus, the central mass divides into two 

 or more smaller rounded or cord-like masses which, joining with 

 those from the other alveoli, form a much closer arrangement than 

 in the cortex ; spaces (fig. 306, &) are left within those anastomosing 

 cords, in which are found portions of the trabecular meshwork and 

 the continuation of the lymph-path. 



The lymph enters the gland by several afferent vessels, which 

 pierce the capsule and open into the lymph-path ; at the same time 

 they lay aside all their coats except the endothelial lining, which is 

 continuous with the lining of the lymph-path. The efferent vessels 

 begin in the medullary part of the gland, and are continuous with 



