Sensory, interneuronal, and motor interactions within Hermissenda visual pathway

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Abstract
The visual pathway of H. crassicornis was identified by means of intracellular recordings and iontophoretic injection of the fluorescent dye lucifer yellow. This pathway consisted of 5 neuron types: type B photoreceptors and the medial type A photoreceptor within each of the 2 eyes, hair cells in the 2 statocysts, a group of interneurons in the cerebropleural ganglia and a putative motor neuron (MN1) in each pedal ganglion. The visual pathway identified in this experiment was considered to have some significance in explaining, at least in part, a causal role for changes within type B photoreceptors in producing Hermissenda''s modified behavior following associative conditioning.

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