Junctional systems in the pineal gland of the Wistar rat (Ratus ratus). A freeze-fracture and thin section study.

Intercellular junctions between neighbouring pinealocytes, glial cells, glial cells and pinealocytes as well as between nerve endings and parenchymal cells of the pineal gland of Wistar rats were investigated on freeze-fracture replicas and thin sections by transmission electron microscopy. Gap junctions, tight junctions and the annular gap junctions have been revealed. In addition, chemical synapses between nerve endings and pinealocytes have been observed.