The electrical responses of osphradial nerve and central neurons to chemicals stimulation of Lymnaea osphradium.

The osphradial sensory system of the mollusc Lymnaea stagnalis was studied by electrophysiological methods. Bioelectrical activity of the osphradial nerve appeared to be dependent on concentrations of D2, mannit, urea and NaC1 in surrounding media. Studies on impulse activities of axons of the osphradial nerve disclose diverse units. Each of them has its own range of response, often overlapping with the others. Several large neurons and cell clusters, answering to the adequate osphradial stimulation, were identified in the viscero-parietal complex. This response is expressed as excitation, inhibition and redistribution of impulse patterns. The participation of the osphradial sensory system in the regulation of vegetative functions of Lymnaea is discussed.