Mapping of neurons participating in the innervation of the body wall of the snail.

The results of experiments on the retrograde staining of the left-sided cutaneous nerves of the pedal ganglia of the snail Helix lucorum L. are presented in this paper. The bodies of nerve cells contributing processes to these nerves were identified by means of the precipitation of nickel and cobalt ions by rubeanic acid. A large number of neurons were found, including the parietal command neurons, in all the ganglia, with the exception of the buccal. An especially large number of neurons were stained in the ipsilateral pedal, pleural, and parietal ganglia.