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The remotor neuromusculature of the uropod propodite in crayfish differential innervation and activation of heads


, : The remotor neuromusculature of the uropod propodite in crayfish differential innervation and activation of heads. Society for Neuroscience Abstract Viewer & Itinerary Planner : Abstract No 500 17

The uropod remoter muscles (Re) have been relatively little investigated compared to other tailfan muscles, although their involvement in most behaviors involving the tailfan seems likely. Their complex structure, five heads arising dorsally from the lateral, anterior, and caudal-medial exoskeleton of abdominal segment 6 and converging on two adjacent insertions on the dorsal rim of the propodite, also makes them interesting as regards muscle evolution (Antonsen & Paul 2000; Paul, Then, Magnuson 1985). Backfills of the whole Re nerve of Procambarus clarkii reveal somata (apprx20-40 mum in diameter) in three ipsilateral clusters in abdominal ganglion 6 (G6): caudal, medial, and lateral, with usually 9, 6, and 2 somata, respectively, plus ltoreq5 axons which pass through G6 without branching and enter the connective. Comparisons among backfills of the whole Re nerve and its individual branches show that the lateral and medial heads share 3 caudal cluster cells, but are also innervate by 2-3 non-shared caudal cluster and different (M2 and M1, respectively) medial cluster cells. The complete innervation of the dorsal heads is uncertain due to the difficult dissection and variable location of the nerve branch, but it includes M1 and at least one caudal cell. All neurites are ipsilateral and more profuse and anterior for medial branch cells than for lateral branch cells. Clearly, the Re innervation is more complex than 2 lateral and 2 medial phasic neurons (Larimer & Kennedy 1969). Electromyograms recorded concurrently from the different Re heads display both tonic and phasic activity, with varying and different degrees of synchrony between heads, in association with postural change, walking, turning, defense, and tailflipping. Our data indicate that the activation as well as the innervation of the Re heads is differential, implying continuously varying motor control of this muscle during both tonic and phasic behaviors.

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