[Ultrastructural organization of the auditory nerves of Gryllus bimaculatus and G. campestris crickets].

Electron microscopic observations have been made on transverse sections of the auditory (tympanal) nerve of the crickets at various levels from the tympanal ganglion (close to the ganglion, 150, 250, 1,000, 2,000 and 3,000 mu from the latter). In the vicinity of the ganglion, axons of the auditory receptors are separated from each other by the processes of Schwann cells. Beginning from the level of 150-250 mu, the axons are subdivided and form, with the help of collaterals, a subreceptor plexus which is similar to that found in the auditory system of the locust.