THE ADRENAL BODIES 121 



solutions, the section shows vacuoles as do those of the chroma- 

 phil body. These are absent in sublimate and Flemming 

 preparations. 



Thus it seems justifiable to regard the medulla of the adrenal 

 body as composed of chromaphil cells of the same general 

 character as those forming the chromaphil bodies. But the 

 former have undergone specialization, and the structure of 

 the substance has become elaborated into an organ with more 

 definitely glandular form. 



It is clear from all that has gone before that the extra-adrenal 







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 I jEr^ - 9j * . g-r\ ^ 



FIG. 35. Section through a group of chromaphil cells in the inferior cervical 

 ganglion of a dog. 



chromaphil tissues contain a substance which gives the same 

 macro- and micro-chemical reactions as adrenin. It has been 

 shown by Biedl and Wiesel that the " parasomata " (Neben- 

 korper) discovered by Zuckerkandl in the human subject 

 contain adrenin or some substance which has an identical 

 effect upon the blood-pressure. The present writer has 

 been able to prove that the abdominal chromaphil bodies 

 of the dog contain the same or a similar substance. Fig. 

 36 shows the effect of injecting into the saphenous vein of a 

 dog an extract from the chromaphil bodies of three dogs. It 



