[Innervation of the adrenal chromaffin cells of Anas boscas. Ultrastructural study].

The authors report on ultrastructural study of large nerve trunks, preterminal section of axons and sympatic contacts with chromaffin cells in adrenal gland of "Anas boscas". Only in rare cases, islets of chromaffin cells occur in the deep parts of parenchyma and, in their center, a fray of nerve fibres can be described.