Terminal Projection of Descending Interneurones Controlling Uropod Movements of the Crayfish Procambarus clarkii Girard

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Three types of descending interneurones (type A, B and C) that project into the terminal abdominal ganglion and control the movements of the uropod have been classified according to their physiological and morphological characters in the crayfish Procambarus clarkii (Girard) using intracellular recording and staining. They were activated by electrical stimulation of a small bundle of isolated fibres in a lateral portion of the ventral nerve cord containing the extension evoking fibres. The type A and B interneurones responded to each stimulus pulse with a spike in one-to-one fashion. The type A interneurones had antagonistic effects on uropod closer and opener motor neurones , while the type B interneurones coactivated both motor neurone types. The type C interneurones were activated indirectly by electrical stimulation and had antagonistic effects on the uropod motor neurones. The axons of the three types of interneurones descended in a dorso-lateral regions of the abdominal fifth-sixth connective, and entered the neuropil in the lateral dorsal tract. Type A and B interneurones were restricted to different regions of the bundle . Within the terminal abdominal ganglion, their branches were restricted to the dorsal neuropil, where numerous branches of premotor nonspiking local interneurones and motor neurones controlling the uropod movements project.
社団法人日本動物学会の論文
1995-10-15