Crayfish Local Bilateral Spiking Interneurons : Role in Contralateral Uropod Motor Pattern Formation(Physiology)

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Both touching the exopodite and stimulating electrically the second root afferents of the terminal abdominal ganglion of the crayfish Procambarus clarkii Girard caused the reciprocal activation of the contralateral uropod motoneurons: spontaneous discharge rate of the closer Red MN No. 1 increased and that of opener motoneurons decreased. This reciprocal motor pattern was formed by the local circuitry within the terminal abdominal ganglion. Since neither the second root afferents nor the motoneuron dendrites did cross the midline of the ganglion, transmission of sensory inputs across the midline was investigated by intracellular current injection and staining of related neurons. We found local bilateral spiking interneurons (LBSNs) which extended their branches bilaterally in the ganglion. They received excitatory inputs, presumably monosynaptically, from the second root afferents on their somata side. They could form the reciprocal activity of the antagonistic uropod motoneurons on the contralateral side to their somata when current was injected intracellularly. Artificial depolarization of the LBSNs increased spike activity of the Red MN No. 1 and decreased that of opener motoneurons. We hence concluded that the LBSNs transmit the sensory inputs to the contralateral uropod motoneurons. Four types of structurally and physiologically distinct LBSNs were discriminated. Many of them seemed to be functionally polarized and had separate input (=soma side) and output (= contralateral side) branches. Their role in the neural circuitry for the contralateral uropod motor pattern formation in response to the sensory stimulation of the tail fan was discussed.
社団法人日本動物学会の論文
1985-10-15

Crayfish Local Bilateral Spiking Interneurons : Role in Contralateral Uropod Motor Pattern Formation(Physiology)

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