[The ultrastructure of epithelial and myoepithelial oncocytes in the human parotid gland (author's transl)].

: Oncocytes are well known to occur in the tissue of many organs for over 30 years. Their origin and function are less well known. We observed different types of oncocytes in a human parotid gland with the electron microscope. Besides a hyperplasia of mitochondria they show more or less advanced signs of membrane degeneration of these organelles. On the basis of our findings we discuss oncocyte formation as a special form of cellular aging in an otherwise healthy gland.