Abstract
The adrenal cortex has a local stimulatory action on synthesis and secretion of adrenaline by the adrenal medulla. This interaction may be based on nervous transmission and/or on glucocorticoids secreted trom the cortex either exerting paracrine effects or reaching the medulla through the local vascular system. The existence of a dual capillary network, a portal system, now seems unlikely. However, a new concept is postulated: the high demand for glucocorticoids in the medulla may be met by local transfer to blood vessels within the adrenal gland, particularly the medullary arteries.
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