76 



IMMUNOLOGY 



with the supraclavicular group. It is commonly taught that lym- 

 phatic drainage in the lung is from the periphery to the hilus, al- 

 though Neff (1933) has described a number of cases of central 

 pneumonia in children where extension from the hilus toward the 

 periphery occurred. Winternitz (1920) definitely established that 



Pyjimonafy Pleird 

 fv/iscecal) dnd 



o-f Luntf 



Polrnondt'Y Mo</es 

 located <3t 

 bifurcation 

 of B»-onchv. 



BroncWo-polmo«a»-Y 

 Nodes ned>- Hilus 



4^ 4^ 



Inf ei-ior TrdcVieo- 

 broncViial Nodes 



Lateral TracV^eo 

 broncViial Nocles 



-> 



Suprd- clavicuiar 

 tSodes 



Broncho medi a sfindl 

 Trunk 



Fig. 3. — Pulmonary pleural, and tracheal lymphatic drainage. 



Peri pViery 

 of LunjJ 



Pig. 4. — Drainage of periphery of lung. 



infection of the upper respiratory tract may extend down the 

 lymphatics of the tracheal wall and lead to acute pulmonary in- 

 flammation called pneumonia. 



Hematogenous Extension.— An excellent example of hematog- 

 enous spread of infection is seen in miliary tuberculosis. Here 

 some focus of infection ruptures into the blood stream and the 



