532 



COLLEGE ZOOLOGY 



Artery 

 Vein 

 EmnnnD Lymphatic 



Superior 

 vena cava 



Right 

 subclavian 



Pulmonary 

 Lung 



Jugular 

 Carotid 



Left 

 subclavian 



Thoracic 

 (lymphatic) duct 



Pulmonary 



Heart 

 Dorsal aorta 



Spleen 



Inferior vena cava 

 Lymphatic duct 



Lacteals 



Intestine 



Lymph nodes 



Figure 386. The larger blood and lymphatic vessels in man, together with some of the 

 organs they serve. The lymph flows in only one general direction, toward the heart. 



of the junction of the left subclavian and 

 internal jugular veins. From here it is car- 

 ried into the right atrium, then into the 

 right ventricle, which forces it through 

 the pulmonary arteries into the lungs. From 

 the lungs it is returned by the pulmonary 

 veins to the left atrium and then into the 

 left ventricle, which forces it through the 

 aorta to all parts of the body. From the cap- 

 illaries, the digested food diffuses into the 



tissue fluid in the intercellular spaces, and 

 from the tissue fluid into the cells where it 

 is metabolized or stored. 



Lymph nodes are located along the course 

 of the lymph vessels. The node has a dual 

 function: it produces lymphocytes, and is an 

 organ in which lymph is filtered and puri- 

 fied as it flows through. Many kinds of 

 cancers tend to spread by way of the Impha- 

 tic vessels. 



