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INVESTIGATION OF SINGLE ANTENNULAR MOTONEURONS IN THE LATERAL ANTENNULAR NEUROPIL OF CALLINECTES SAPIDUS

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ABSTRACT Single cell analysis has been performed on motoneurons innervating the muscles of the antennular distal segments of Callinectes sapidus. Experiments were performed on perfused, isolated "head" preparations in which two spontaneous antennular movements occurred: withdrawal and flicking. The secondary neurites of cells thought to be involved in these two antennular movements were shown to occupy different regions of the lateral antennular neuropil by Lucifer Yellow injection. Single shocks delivered to the sensory nerve coming from a previously quantified mechanoreceptive input from hair sensilla on the antennular proximal segment produced a complex, multicomponent response in motoneurons considered to be involved in withdrawal behavior. Distal segment motoneurons believed to be responsible for antennular flicking were inhibited by hair sensillar afferents. These anatomical and physiological findings suggest the presence of an underlying organization in so-called "diffuse" antennular neuropil.

10.1163/193724091X00013
/content/journals/10.1163/193724091x00013
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/content/journals/10.1163/193724091x00013
2017-10-19

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