CILIARY ARREST CONTROLLED BY IDENTIFIED CENTRAL NEURONS IN A UROCHORDATE (ASCIDIACEA)
CILIARY ARREST CONTROLLED BY IDENTIFIED CENTRAL NEURONS IN A UROCHORDATE (ASCIDIACEA)
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DOI：
10.1007/bf00610225
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发表时间：
1987-01-01
影响因子：
2.1
通讯作者：
ARKETT, SA
中科院分区：
文献类型：
--
作者：
ARKETT, SA
1. A new preparation is described for examining the central control of ciliary arrest (Figs. 1, 2). This preparation allows intracellular recording from neurons within the central ganglion of the ascidian Chelyosoma productum. 2. An identifiable class of neurons (''ciliary arrest'' or CA neurons) directly control the arrest of stigmatal cilia in the branchial basket. CA neurons spike 1:1 with extracellularly recorded ''ciliary arrest potentials'' (CAPs) (Figs. 7, 8), both of which are directly correlated with basket-wide ciliary arrests (Figs. 2, 3). 3. Ciliary beating is modulated by the firing frequency of CA neurons (Fig. 7). At frequencies greater than about 0.15 Hz, cilia remain arrested. 4. Intracellular recordings from stigmatal ciliated epithelial cells show spikes 1:1 with CAPs (Fig. 4). Ciliated epithelial cell action potentials appear to result from chemically-mediated post-synaptic events produced directly by CA neuron action potentials. 5. The amplitude of CAPs can be reduced and ciliary arrests eventually blocked by increasing concentrations of Mg++ and d-tubocurarine (Fig 5). 6. Conduction of CAPs and ciliary arrest within stigmata and throughout the branchial basket is reversibly blocked by octanol (Fig. 6). 7. Lucifer Yellow fills of CA neurons reveal cells bodies with diameters of 15-20 .mu.m, small dendritic fields, and long unbranched axons (Fig. 9). Most CA neuron axons exit from the ganglion via a posterior root and constitute a portion of the visceral nerve. Only one CA neuron axon exits an anterior root.
