Abstract

The localization of biogenic monoamines in the CNS of the Pacific nudibranch molluskTritonia sp. was investigated by the method of Falck and Hillarp. Neurons with specific yellow luminescence, evidently due to serotonin, were found in the cerebral, pedal and gastro-esophageal ganglia. Yellow luminescence is seen in the neuron bodies, and also in the intermediate segment and axons and their terminals. Yellow and green luminescence is observed in the neuropil plexuses of nerve fibers and their terminals. The number of nerve fibers with green luminescence is much greater than the number of neurons with the same luminescence. Nerve fibers with green and yellow luminescence are present in most nerves, connectives and commissures of the triton central nervous system (CNS).

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