Abstract
The adrenal glands of perfusion fixed rats were investigated by light and electron microscopy. Within the rat adrenal cortex occurred rays and islets of chromaffin cells which were in close contacts with cortical cells on the electron microscopical level. We achieved to catch the process of exocytosis from a chromaffin cell located within the zona glomerulosa in direct apposition with an adrenocortical cell. The documentation of an exocytotic process from a chromaffin cell neighbouring a cortical cell provides direct evidence in support of a paracrine regulation of the cortex mediated by chromaffin cells.
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