88 GENERAL ANATOMY. 



On account of the peculiar arrangement of the framework of the organ, the 



FIG. 65. From the medullary substance of an 

 inguinal gland of the ox. (After His.) a. Lymph- 

 tube, with its complicated system of vessels, b. 

 Fir,. 64.-Folliclc from a lymphatic gland of the dog, Retinacula stretched between the tube and the 

 in vertical section, a. Reticular sustentacular substance | e P ta - c - Portion of another lymph-tube, d. 

 of the more external portion, 6, of the more internal, and >.epta. 

 c, of the most external and most finely webbed part on the 

 surface of the follicle, d. Origin of a large lymph-tube. 

 e. Of a smaller one. /. Capsule, g. Septa, h. Vasafferens. 

 i. Investing space o'f the follicle, with its retinacula. k. 

 One of the divisions of the septa. 1,1. Attachment of the 

 lymph-tubes to the septa. 



gland-pulp in the cortical portion is disposed in the form of nodules, and in the 



medullary part in the form of 

 rounded cords. It consists of 

 ordinary lymphoid tissue, be- 

 ing made up of a delicate re- 

 ticulum of retiform tissue, 

 which is continuous with that 

 in the lymph-paths, but mark- 

 ed off from it by a closer retic- 

 ulation ; in its meshes are 

 closely packed lymph-corpus- 

 cles, traversed by a dense 

 plexus of capillary blood-ves- 

 sels. 



The afferent vessels, as 

 above stated, enter at all parts 

 of the periphery of the gland, 

 and after branching and form- 

 ing a dense plexus in the sub- 

 stance of the capsule, open 

 into the lymph-sinuses of the cortical part. In doing this they lose all their 

 coats except their endothelial lining, which is continuous with a layer of similar 

 cells lining the lymph-paths. In like manner the efferent vessel commences 

 from the lymph-sinuses of the medullary portion. The stream of lymph carried 

 to the gland by the afferent vessel thus passes through the plexus in the capsule 

 to the lymph-paths of the cortical portion, where it is exposed to the action of the 

 gland-pulp ; flowing through these, it enters the paths or sinuses of the medullary 

 portion, and finally emerges from the hilum by means of the efferent vessel. The 

 stream of lymph in its passage through the lymph-sinuses is much retarded by 

 the presence of the reticulum. Hence morphological elements, either normal or 



FIG. 66. Section of lymphatic gland tissue, a. Trabeculee. b. 

 Small artery in substance of same. c. Lymph-paths, d. Lymph- 

 corpuscles, e. Capillary plexus. 



