INTELLIGENCE, POWER, 



flight, impulses are sent to the adrenal-sympathetic system, 

 and from there adrenalin is sent to the brain, giving the 

 stimulation that the brain and the sympathetic system 



Vagus 



Aorta 



Splanchnic nerve - 



Coeliac artery 



Coeliac plexus * 



Sup. mesenteric artery- 

 Nerve to /?. adrenal 



Inferior vena cava 

 (Note its position on ventral 

 surface of right adrenal) 



Right kidney 



External iliac vein 



Separate kidney lobe 



1st. thoracic gang/ion 



Double abdominal 

 sympathetic chain 



Coe/iac gang/ ion 



Superior mesenteric 

 plexus 



^ Aortic plexus 



_______ Branch 



~" (from plexus to /. adrenal) 



Left adrenal 



Testis 



?!jP Left renal vein 



Caudal vein 



FIG. 24. The sympathetic nervous system of the bird (horned owl). 



require. Animals are bipolar mechanisms. Their energy- 

 controlling systems are divided into two parts: that which 

 controls the positive potential and that which controls 

 the negative potential. The positive potential is generated 

 and maintained by the brain and the sympathetic system. 

 The negative potential is generated and maintained by the 

 heart and the vascular system. 



The force and frequency of the heart beat is correlated 

 with the degree of intensity of stimulation of the brain. 

 Oxidation itself completes the metabolic arc, as in the 

 carbon lamp. Thus are basic and adaptive metabolism 

 executed. 



194 



