Swimming in the Pteropod Mollusc, Clione Limacina: II. Physiology
Swimming in the Pteropod Mollusc, Clione Limacina: II. Physiology
复制标题
在翼足类软体动物中游泳，Clione Limacina：II。
DOI：
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
A. Spencer
中科院分区：
文献类型：
--
作者：
R. Satterlie;A. Spencer
摘要通过切割实验对青蟹游泳中枢模式发生器（CPG）进行定位。每个翅膀的一个单独的模式发生器位于同侧足神经节。CPG紧密耦合，但可以通过切断踏板连合来隔离。去除大脑神经节导致游泳频率和规律性降低，表明CPG的下行调制。两类足神经元显示与游泳运动同相的放电模式。一类是游泳运动神经元，进一步分为抑制神经元和提升神经元。运动神经元记录显示复杂的阈下活动，包括交替的去极化和超极化。在拮抗运动神经元中，复合物活性处于反相。重要的运动神经元-运动神经元相互作用不发生在中枢，因为既没有电耦合也没有化学突触相互作用。注入电流不改变运动神经元放电节律或游泳节律。运动神经元胞体位于同侧足神经节的外侧区域，靠近翼神经的出现。每个运动神经元为翼神经提供一个轴突，翼神经在翅膀中反复分支。每个运动神经元都有一个非常大的神经支配区域，有些覆盖了一半的翅膀区域。第二类足神经元显示与翅膀上摆或下摆同相的放电模式，它们是足-足间神经元。每个游泳间神经元在两个足神经节中提供轴突分支，轴突在足连合中延伸。在运动神经元分支的区域内，每个足节的外侧神经桩中出现神经元间轴突分支。游泳interneurons大概发挥了重要作用，双边协调的翅膀，并参与图案的产生，因为注入电流被发现，以加速或减缓发射节奏的interneurons和运动神经元，和翅膀的运动。
SUMMARY The central pattern generator (CPG) for swimming in Clione limacina was localized in cutting experiments. A separate pattern generator for each wing is located in the ipsilateral pedal ganglion. The CPGs are tightly coupled but can be isolated by severing the pedal commissure. Removal of the cerebral ganglia results in a decrease in swim frequency and regularity suggesting descending modulation of the CPGs. Two classes of pedal neurones display firing patterns in phase with swimming movements. One class, swim motor neurones, are further divided into depressor and elevator groups. Motor neurone recordings show complex subthreshold activity consisting of alternate depolarizations and hyperpolarizations. The complex activity is in antiphase in antagonistic motor neurones. Significant motor neurone-motor neurone interactions do not occur centrally as neither electrical coupling nor chemical synaptic interactions could be demonstrated. Injected currents do not alter the motor neurone firing rhythm or the swimming rhythm. Motor neurone cell bodies are located in the lateral region of the ipsilateral pedal ganglion, near the emergence of the wing nerve. Each motor neurone provides a single axon to the wing nerve which branches repeatedly in the wing. Each motor neurone has an extremely large innervation field, some covering up to half of the wing area. The second class of pedal neurones that display firing patterns in phase with either wing upswing or downswing are pedal-pedal inter neurones. Each swim interneurone provides axon branches in both pedal ganglia and the axon runs in the pedal commissure. Interneurone axon branches occur in the lateral neuropile of each pedal ganglion, in the region of motor neurone branching. The swim interneurones presumably play a major role in bilateral coordination of the wings and are involved in pattern generation since injected currents were found to accelerate or slow the firing rhythms of interneurones and motor neurones, and wing movements.
影响因子：
56.9
作者：
DELCOMYN, F
通讯作者：
DELCOMYN, F