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Pedal serotonergic neuron clusters of the pteropod mollusc, Clione limacina , contain two morphological subtypes with different innervation targets
Invertebrate Neuroscience Pub Date : 2020-11-10 , DOI: 10.1007/s10158-020-00256-0
Jennifer B Plyler 1 , Richard A Satterlie 1
Affiliation  

Each pedal ganglion of the pteropod mollusc Clione limacina contains a cluster of serotonin-immunoreactive neurons that have been shown to modulate contractions of the slow-twitch musculature of the wing-like parapodia, and contribute to swim accelerations. Each cluster has a variable number of neurons, between 5 and 9, but there is no significant difference between right and left ganglia. In experiments with electrophysiological recordings followed by dye-injection (carboxyfluorescein), the clusters were found to contain two subsets of neurons. The majority innervate the ipsilateral wing via nerve n4. Two of the neurons in each cluster send processes out of the pedal ganglion in nerves n3 and n8. The processes in nerve n3 innervate the body wall of the neck region, while those in nerve n8 innervate the body wall of the tail. The baseline electrophysiological activity of the two subsets of neurons was different as “wing” neurons had constant barrages of small synaptic activity, while the “body wall” neurons had few synaptic inputs. The potential roles of the Pd-SW cluster in swim acceleration (wing neurons) and control of fluid pressure in the body and wing hemocoelic compartments (body wall neurons) are discussed.



中文翻译:

翼足类软体动物 Clione limacina 的踏板血清素能神经元簇包含两种具有不同神经支配目标的形态亚型

翼足类软体动物Clione limacina 的每个足神经节含有一组血清素免疫反应神经元,已被证明可以调节翼状副足的慢肌组织的收缩,并有助于游泳加速。每个簇具有可变数量的神经元,在 5 到 9 个之间,但左右神经节之间没有显着差异。在电生理记录后进行染料注射(羧基荧光素)的实验中,发现这些簇包含两个神经元子集。大多数通过神经 n4 支配同侧翼。每个簇中的两个神经元从神经 n3 和 n8 中的足神经节发送过程。神经 n3 中的突起支配颈部的体壁,而神经 n8 中的突起支配尾部的体壁。两个神经元子集的基线电生理活动是不同的,因为“翼”神经元具有恒定的小突触活动,而“体壁”神经元几乎没有突触输入。讨论了 Pd-SW 簇在游泳加速(翼神经元)和控制体内流体压力和翼血腔室(体壁神经元)中的潜在作用。

更新日期:2020-11-12
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