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 stu died by electrophysiological methods. Bioelectrical activity of the os phradial nerve appeared to be dependent on concentrations of O-2, mann it, urea and NaCl 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. Seve ral large neurons and cell clusters, answering to the adequate osphrad ial 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.