THE PITUITARY BODY 775 



and epinephrine do not appear to act on exactly the same peripheral 

 mechanism (see page 767). 



4. With the Isles of Langerhans. Since pituitrin affects carbohydrate 

 metabolism, which is thought to be primarily controlled by the Isles of 

 Langerhans, it is claimed by some observers that a relationship also 

 exists between the pituitary and these structures. Injections of duodenal 

 extracts are also said to cause a hypersecretion of pituitrin into the 

 cerebrospinal fluid. 



