|6. Adrenals - location behind the kidneys -
secretion of the cortex adrenals unknown, of the medulla adrenals adrenalin.
glands are each of them dual and are situated on both sides of the abdomen, astride and
back of the kidneys. They are concerned with general growth, and the growth of the brain
cells. The adrenal cortex secretion (to which no name has been given) is one source of the
internal secretions producing maturity. 
The adrenal glands, however, are primarily the glands of combat. They produce that
immediate and active response which men exhibit in times of danger or anger, and their
secretion is stimulated in times of emergency. Pain, rage and fear have a definite effect
upon the discharge, and we are told,
the evidence points to its medulla as the secretor of the substance which makes for the
phenomena of fear, and to its cortex as dominant in the reactions of anger."
- Berman, Louis, M.D., The Glands Regulating Personality, p. 76.
"Courage is so closely related to fear and anger that all are always associated in
any discussion. Courage is commonly thought of as the emotion that is the opposite of
fear. It would follow that courage meant simply inhibition of the adrenal medulla. As a
matter of fact the mechanism of courage is more complex. One must distinguish animal
courage and deliberate courage. Animal courage is literally the courage of the beast. As
noted, animals with the largest amounts of adrenal cortex are the pugnacious, aggressive,
charging kings of the fields and forests. The emotion experienced by them is probably
anger with a sort of blood-lust, and no consideration of the consequences. The object
attacked acted like a red rag waved at a bull - it had stimulated a flow of the secretion
of the adrenal cortex, and the instinct of anger became sparked, as it were, by the new
condition of the blood. In courage, deliberate courage, there is more than instinct. There
is an act of volition, a display of will. Admitting that without the adrenal cortex such
courage would be impossible, the chief credit for courage  must be ascribed to the
ante-pituitary. It is the proper conjunction of its secretion and that of the adrenal
cortex that makes for true courage. So it is we find that acts of courage have been
recorded most often of individuals of the ante-pituitary type."
- Berman, Louis, M.D., The Glands Regulating Personality, p. 177.