Output Effect of Identified Ascending Interneurons upon the Abdominal Postural System in the Crayfish Procambarus Clarkii : Girard

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The output effects of 16 identified ascending interneurons originating in the terminal abdominal ganglion were examined with intracellular recording and stimulating techniques in isolated nerve cord composed of 6 abdominal ganglia (from the 1st to 6th ganglion). The activity of the uropod closer and opener motor neurons was recorded extracellularly with pin electrodes from the terminal abdominal (A6) ganglion and that of the abdominal extensor and flexor motor neurons was recorded from the 1st to 5th abdominal (A1-A5) ganglion. This technique allowed us to monitor the activity of the motor neurons innervating different muscles of more than 10 simultaneously in the same preparation. Majority of ascending interneurons had output effects upon not only the uropod motor neurons but also the abdominal postural motor neurons. The premotor effects of the ascending interneurons were the same in all of abdominal ganglia (A1-A5). Some ascending interneurons also affected the abdominal postural motor neurons on both sides of each ganglion with a similar fashion. Neurobiotin staining revealed that the ascending axons spreaded their branches in each abdominal ganglion. Their branches were extended within the side ipsilateral to their axons. The possible function of ascending interneurons as multi-functional units in the sensory-motor system of crayfish was discussed. Since they received sensory inputs from the tailfan and affected the activity of both uropod and abdominal postural motor neurons simultaneously, they would coordinate the behavioural sequence controlling both the uropod motor system and abdominal postural system.
社団法人日本動物学会の論文
1994-04-15

Output Effect of Identified Ascending Interneurons upon the Abdominal Postural System in the Crayfish Procambarus Clarkii : Girard

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