Identification of neuronal connections in the central nervous system of Onchidium verruculatum

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  • 片山 芳文
    Division of Bioelectronics, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University

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  • IDENTIFICATION OF NEURONAL CONNECTIONS IN THE CENTRAL NERVOUS SYSTEM OF <I>ONCHIDIUM VERRUCULATUM</I>

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1. Investigations were made on the nervous system of Onchidium verruculatum, pulmonate mollusc. A microelectrode was inserted into the soma of the giant neuron on the dorsal surface of the perioesophageal ganglion complex in order to record the change in membrane potential.<BR>2. Peripheral nerve trunks were stimulated electrically through bipolar electrodes. Each peripheral stimulus evoked the change in the membrane potential which were averaged by the digital computer, LINC-8.<BR>3. The analysis of the averaged responses could disclose the modes of synaptic connections, including a direct connection; i. e. an axon or an axonal branch.<BR>4. On the basis of the averaged responses, neuronal connections were deduced between peripheral nerve trunks and ganglion cells which could be always identified under a binocular microscope.<BR>5. The possibility and the limitation of the averaging technique are discussed.

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