194 



LYMPHATIC SYSTEM. 



inside of a mould in which it had been cast. This S23ace is both a 

 receptacle and a channel of passage for the lymph that goes through the 



Fis. 130. 







n'> 



^-^ 



Gt 



^tfl 



)^)UUi^^ 



Fig. 130. — Section of a Mesenteric Gland of the Ox (magnified 12 diameters). 



The section includes a portion of the cortical part, A, in its whole depth, and a smaller 

 portion of the adjoining medullary part, B ; c, c, outer coat or capsule sending partitions 

 into the cortical part to form alveoli, and trabecule, t, t, which are seen mostly cut across ; 

 d, d, the glandular substance forming nodules in the cortical part. A, and reticulating 

 cords in the medullary part, B ; Z, ^, lymph-sinus or lymph-channel, left white (after His). 



gland ; it is the lymph-sinus (His), or the lymph-channel. It is traversed 

 by retiform connective tissue (fig. 131 c, c), in which the nuclei of the 

 spindle-shaped or ramified cells are mostly apparent, and is filled with 

 fluid lymph, containing many lymph -corpuscles, which may be av ashed 

 out from sections of the gland with a hair pencil, so as to show the 

 sinus, while the firmer gland-pulp, which the sinus surrounds, keeps its 

 place. The latter, the proper glandular substance, is also pervaded and 

 supported by retiform tissue, mostly non-nucleated (fig. 131, a), com- 

 municating with that of the surrounding lymph-sinus, but marked off 

 from it by somewhat closer reticulation at their mutual boundary, not 

 so close, however, as to prevent fluids, or even solid corpuscles, from 

 l)assing from the one to the other. This glandular pulp is made up of 

 densely packed lymph-corpuscles, occupying the interstices of its sup- 

 port hig retiform tissue, and is traversed by an abundant network of 

 capillary blood-vessels {d, d), which runs throughout the proper gland- 

 ular pulp, both cortical and medullary, but does not pass into the 

 surrounding lymph-sinus. The. stellate cells of the retiform tissue of 

 the lymph-sinus often contain a considerable number of pigment 

 granules. Arteries enter and veins leave the gland at the hilus, sur- 

 rounded, in some glands, as already said, with a dense inclosure of 

 connective tissue. The arterial branches go in part directly to the 

 glandular substance, but partly run along the trabeculte. The former 

 end in the glandular capillary network above-mentioned, from which 



