62 



KINETIC HORMONES — I 



Pors intercerebrolis of brain 



Accumulation of neurosecretory 

 material proximal to site of 

 nerve section 



Nervus corp. cardiaci with 

 unobstructed flow of 

 neurosecretory material 



Depletion of neurosecretory 

 material in corp.cardiacum 

 of operated side 



Storage of neurosecretory 

 moterial in corp. cordiocum 

 of operated side 



Larger corp.allatum of 

 operoted side 



Normal corp. ollatum 



Fig. 3-2. Diagram of the dorsal aspect of the brain, corpora car- 

 diaca, corpora allata and the nerves connecting them in the cock- 

 roach, Leucophaea maderae. On the left side the nerve from the 

 neurosecretory cells in the brain has been cut, so that the neuro- 

 secretion accumulates in the proximal part of the nerve and does 

 not reach the corpus cardiacum of that side (from Scharrer, 1952). 



and frequency of the heart beat in Vertebrata. This can only be 

 demonstrated with difficulty in normal mammals, although as 

 little as 1 part of adrenaline in 1,400,000,000 (Turner, 1955) can 

 increase the beat of a denervated heart, freed from the ''depressor" 

 action of parasympathetic fibres of the vagus nerve. It is likely, 

 however, that the action of this drug on the heart is usually 

 through the sympathetic nerve, rather than through the circula- 

 tion, as the drug, or hormone, is quickly destroyed in the tissues 

 by an enzyme. 



3.112 Gilt 7nuscle 



Insecta. The striated muscles in the gut of P^;7/)/^/z^/rt (Cameron, 

 1953) and Locusta will record peristaltic movements for at least 



