Sensory input charactheristics at the chemical stimulation of the lip in the snail Helix pomatia L.

Salánki, János and Bay, Truong Van (1975) Sensory input charactheristics at the chemical stimulation of the lip in the snail Helix pomatia L. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 42. pp. 115-128. ISSN 0365-3005

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Abstract

1. The chemical sensitivity of the lip receptors to various chemicals is different what can be detected by recording the electrical activity from the lip nerve both in brain-lip preparation and in isolated lip preparation. Applying the general depolarizing agent KC1 to the lip, the variation of spike amplitudes is very wide in the increased activity, the selectivity of the responding receptors is well expressed in the case of glucose and saccharose. 3. Distilled water seems to be a stimulus increasing the activity of th receptors differently than does physiological saline. The effects of NaCl, glucose, saccharose and of drugs used in plant-protecting chemistry (dasomet, dipterex and malathion) were also significant in some concentrations. 4. The basic activity of the lip nerve was higher on the isolated lip preparation than on the brain-lip preparation. This refers to the role of the CNS in the control of the activity of sensory neurones. Our electrophysiological records prove that there are neurones in the isolated lip nerve which function even after the isolation of the nerve. 5. Isolated lip preparations gave a somewhat lower response to the same chemical substance than did brain-lip preparations. This can be explained with the presence of a part of the sensory neuronal bodies in the ganglion itself.

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