416 



MOVEMENT OF THE LYMPH. 



[Llldwig'S Experiment- Tie a respiration cannula in the trachea of a dead 

 rabbit; cut across the body of the animal immediately below the diaphragm; 

 remove the viscera, and ligature the vessels passing between the thorax and 

 abdomen; tie the thorax to a ring, and hang it up with the head downwards; 



Section of central tendon of diaphragm The injected lymph spaces, h and A, are 

 black. At /the walls of the space are collapsed (Brunton, after Ludwig and 

 Schweigger-Seidel). 



pour a solution of Berlin blue upon the peritoneal surface of the diaphragm; 

 connect the respiration cannula either with a pair of bellows or an apparatus for 

 artificial respiration, and imitate the respiratory movements. After a few minutes, 

 the lymphatics are filled with a blue injection showing a beautiful plexus.] 



[The same kind of pumping mechanism exists over the costal pleura 

 (p. 224).] 



[The fascia covering the muscles is another similar mechanism. The 

 fascia consists of two layers of fibrous tissue, with intervening 

 lymphatics (Fig. 165). When a muscle contracts, lymph is forced out 



Fig. 165. 



Injected lymph spaces from the fascia lata of the dog The injected spaces are 

 black in the figure (Brunton, after Ludwig and Schweigger-Seidel). 



from between the layers of the fascia, while when it relaxes, the 

 lymph from the muscle, carrying with it some of the waste products 

 of muscular action, passes out of the muscle into the fascia, between the 

 now partially separated layers.] 



(2.) Within the lymph-trunks themselves, the independent contraction 

 of their muscular fibres partly aids the lymph-stream. Heller observed 

 in the mesentery of the guinea-pig, that the peristaltic movement of 



