in the adrenal medulla , the relative proportion of the main adrenal catecholamines , free epinephrine and free norepinephrine , was found to be higher in the medullary sections derived from the subcortical areas where the ratio of epinephrine to norepinephrine was 8:1 than in the centre of the organ where norepinephrine levels reached those of epinephrine .
C0028351
norepinephrine
C0014563
epinephrine