[Synapses between chromaffin cells of the adrenal medulla of mice transplanted into the brain].

Mouse adrenal medullae were transplanted into the brain and studied 4 weeks or more later. In these transplants, some chromaffin cells extend neurite-like processes and form synapses on other chromaffin cells. These synapses exhibit the ultrastructural features of chemical synapses. The possible neoformation of these synapses after transplantation is discussed.