EPITHELIAL AND ENDOTHELIAL TISSUE. 



347 



send prolongations the follicular cords into the middle por- 

 tion, the so-called medulla of the ganglion, and here the follicular 

 cords freely unite to form a coarse reticulum, which is more 

 or less distinctly marked from the surrounding interfollicular 

 strings. The portion of the lymph-ganglion giving exit to the 

 lymph-vessels is characterized by a relatively compact forma- 

 tion of fibrous connective tissue, inclosing elongated, empty 

 spaces. This is the so-called hilus-stroma of His. The connect- 

 ive-tissue trabeculae are known to be the carriers of the lymph- 

 vessels, which are in open communication with the lymph-spaces 

 or sinuses around the follicles, and in the follicular cords. All 

 these spaces are lined by a single endothelial layer, and they are 



FIG. 146. LYMPH-GANGLION. TRANSVERSE SECTION. 



C, connective-tissue capsule, outside with fat-lobules, FA ; FO, lymph-follicle ; FS, 

 follicular cord ; IF, interfollicular string, with numerous blood-vessels. Magnified 100 

 diameters. 



also in direct connection with the meshes of the myxomatous 

 reticulum. An endothelial investment has been found only on 

 the larger trabeculae of the myxomatous reticulum. The meshes 

 of the reticulum of the interfollicular strings contain compara- 

 tively few lymph-corpuscles, while the meshes of the extremely 

 delicate reticulum of the follicles and the follicular cords are 

 crowded with them. 



Two or more afferent lymph-vessels enter the ganglion on 

 one pole and divide into a number of branches, the endothelium 



