Ultrastructure of astroglial contacts in rat cerebellar cortex

Interfaces of the astroglial Bergmann fibres in the rat cerebellar cortex were investigated under the electron microscope. The straight interfaces revealed numerous contacts of a special junctional type having a mean length of 0.9 micro m. A substantial area of the Bergmann fiber surfaces was found to be connected with these junctions. Electron-dense material forming knoblike particles were observed attached with a certain regularity to the inner surfaces of both junctional membranes.