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HANDBOOK OF PHTSTOLOGT. 



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 of the gland tissue than in the cortex; spaces (fig. 

 284, V), are left within those anastomosing cords, in which are found 

 portions of the trabecular meshwork and the continuation of the lymph 

 sinus. 



The essential structure of lymphatic-gland substance resembles that 

 which was described as existing, in a simple form, in the interior of the 

 solitary and agminated intestinal follicles. 



The lymph enters the gland by several afferent vessels, which open 



Fig. 284. A small portion of medullary substance from a mesenteric gland of the ox. d, d, tra- 

 beculae; o, part of a cord of glandular substances from which ah* but a few of the lymph-corpuscles 

 have been washed out to show its supporting meshwork of retiform tissue and its capillary blood- 

 vessels (which have been injected, and are dark in the figure); 6, 6, lymph-sinus, of which the reti- 

 form tissue is represented only at c, c. X 300. (Kolliker.) 



beneath the capsule into the lymph-channel or 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 the 

 lymph-path here as the afferent vessels were with the cortical portion; 

 the endothelium of one is continuous with that of the other. 



The efferent vessels leave the gland at the hilus, the more or less 

 concave inner side of the gland, and generally either at once or very 

 soon after join together to form a single vessel. 



Blood-vessels which enter and leave the gland at the hilus are freely 

 distributed to the trabecular tissue and to the gland-pulp. 



