LYMPHATIC GLANDS. 



443 



Fig. 7. 



The lymphatic glands are supplied with blood by some- 

 times one, but generally several small arteries, which pen 

 etrate at the hilum. These vessels pass directly to the 

 medullary por- 

 tion, and there 

 break up into 

 several coarse 

 branches, to be 

 distributed to 

 the cortical sub- 

 stance, where 

 they ramify in 

 an exceedingly 

 delicate capil- 

 lary net-work, 

 with rather 

 wide meshes, 

 in the closed 

 follicles found 

 in this portion 

 of the gland. 

 This capillary 

 plexus also re- 

 ceives branches Different varieties of lymphatic glands. (SAPPEY, Traite 

 <V Anatomic Descriptive, Paris, 1853, tome i., p. 632.) 



from small ar- 

 terial twigs which penetrate the capsule of the gland at dif- 

 ferent points. Returning on themselves in the form of loops, 

 the vessels unite to form one or more large veins, which gen- 

 erally emerge at the hilum. 



Very little is known regarding the distribution of the 

 nerves in the lymphatic glands. A few filaments from the 

 sympathetic system enter with the arteries, but they have 

 never been traced to their final distribution. The entrance 

 of filaments from the cerebro-spinal system has never been 

 demonstrated. 



It is evident from the structure of the lymphatic glands. 



