234 



THE LYMPH 



cerebrum, spinal cord, eyes, ears and joints. It should also be remem- 

 bered that the lymph of the intestinal radicles assumes a milky appear- 

 ance when much fat is being absorbed. It is then designated as chyle. 

 The following fluids, therefore, may be included in this discussion : 



Lymph 



Intercellular . 



Intra vascular . 



Tissue-fluid throughout the body 

 r Pericardial fluid 



Pleural fluid 



Peritoneal fluid 



Cerebrospinal liquid 



Aqueous humor 



Endo- and perilymph of the internal ear 



Lymph in the collecting channels 

 I Chyle 



Properties of Lymph. Large quantities 

 of lymph may be collected by inserting a 

 cannula into one of the large lymphatic 

 channels, preferably the thoracic duct of 

 the dog or cat. The latter arises in the 

 upper part of the abdominal cavity and 

 traverses the chest in close proximity to 

 the descending aorta. It empties its con- 

 tents into the left subclavian vein at its 

 point of confluency with the external jugular 



FIG. 119. THORACIC DUCT. 

 (D) At its point of confluency with left sub- 

 clavian vein (<S); C, carotid artery; T, trachea; 

 O, esophagus; LC, longus colli muscle; SA, 

 scalenus anticus; L, lymphatic glands; E, ext. 

 jugular vein. 



FIG. 120. THE DISTRIBUTION OF THB 



LYMPHATICS. 



A, The domain of the thoracic duct 

 (unshaded portion); B, right lymph 

 duct; C, left cervical duct; D, right 

 cervical duct. 



vein. By following the latter into the aperture of the chest, a cannula 

 may be inserted in this duct without rupturing the pleural mem- 



