116 NORMAL HISTOLOGY. 



of fibrous tissue at the hilus and, through it, with the capsule at that 

 point. 



The lymphatic vessel connected with the node divides into a 

 number of branches, the " afferent vessels," which penetrate the 

 capsule at the periphery and open into a wide-meshed reticular 

 tissue lying between the trabeculse and the lymphadenoid tissue of 

 the follicles and the medullary strands. This more open reticular 

 tissue, through which the lymph circulates most freely, forms the 



FIG. 99. 



Portion of the medulla of a lymph-node. (Recklinghausen.) a, a, a, anastomosing columns 

 of lymphadenoid tissue ; b, anastomosing extensions of the cortical trabeculse ; c, lymph- 

 sinus ; d, capillary bloodvessels. The lymphoid cells in the sinus are not shown. 



"lymph-sinuses" of the node, and is less densely crowded with 

 lymphoid cells than the reticular tissue of the follicles and medul- 

 lary lymphoid tissue. The walls of these sinuses, which are turned 

 toward the fibrous tissue of the trabeculse and their extensions in 

 the medulla, are lined with endothelium, and a somewhat similar, but 

 probably much less complete, lining may partially separate the 

 sinuses from the lymphadenoid tissue. However this may be, it is 

 certain that lymphoid cells can freely pass from the lymphoid tissue 

 into the sinuses, or in the reverse direction, and that there is a ready 

 interchange of fluids between the two. 



From the sinuses the lymph passes into a single vessel, the " effe- 

 rent vessel," through which it is conveyed from the node at the hilus. 



The arteries supplied to the lymph-node may be divided into two- 



