The Ultrastructure Of The Afferent Synapse On Hair Cells In The Frog Labyrinth

Abstract

The fine structure of the synaptic contact between sensory cells and afferent nerve terminals of ampullar crista of the frog (Rana temporaria) is described. The specializations of this synapse, including synaptic vesicles, and membrane-related structures, show certain differences according to the fixation and contrasting methods used. Parts of these structures are thought to contain proteins which probably are specific for mediating transmitter from the sensory cell to the afferent nerve ending. The mechanism of the synaptic transmission is discussed and thought to be of neuro-chemical type.