TIIK LYMPHATIC SYSTEM. 



2(31 



skin of the dorsal and plantar surfaces meet on the web and 

 enclose a very rich anastomosis of lymph-capillaries. 



2. The Lymph- Hearts. 



The frog 1 has two pairs of lymph-hearts, one pair anterior, the 

 other posterior. 



A. The anterior lymph-hearts (Fig. 176). These organs lie, 

 one on each side, behind the broad transverse processes of the third 

 vertebra (Miiller, Panizza, Priestley), in a deep triangular space 

 formed by the separation of the fibres of the J/. intertntiuveriariu*, 

 between the transverse processes of the third and fourth vertebrae. 

 Each heart is a rounded sac, slightly elongated anteriorly where 



170. 



Fig- 177- 



N 



The anterior lymph-hearts. 



L The left anterior lymph- 

 heart. 



'.. M. levator scapulae. 



A" Brachial nerve. 



t.x. M. transverso -. scapularis 

 maior. 



1-4 Vertebrae numbered from 

 before backwards. 



The posterior lymph-hearta 



gl M. glutaeus. 



c M. ilio-coccygeus. 



L Posterior lymph-hearts. 



j> M. pyriformis. 



r M. rectus. 



ve M. vastus externus. 



it is connected with the subseapular vein. [The hearts receive 

 lymph from the anterior part of the body and the surrounding 

 parts, and empty their contents into the vertebral vein. Each of 

 these hearts is supplied by a branch from the second spinal nerve 

 (Volkmann, Eckhard, Schiff, Priestley).] 



B. The posterior lymph-hearts (Fig. 177) are situated on either 

 side of the urostyle in the triangular spaces (Miiller, Panizza, 

 Priestley), bounded externally and above by the M. ylutaeus, 



