[The ultrastructure of the pinealocytes of the epiphysis cerebri (pineal body) in mammals].

The detailed description of ultrastructure of pinealocytes, the main hormone producing cells, is presented. The new data concerning vacuolar and vesicular structures, as well as intercellular interaction of pinealocytes are also presented. The state of the problem of investigation of different ultrastructural types of pinealocytes and problems of response of subcellular structures of pinealocytes on exo and endogenic factors are discussed.