Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC, 28409, USA.
Invert Neurosci. 2020 Nov 10;20(4):21. doi: 10.1007/s10158-020-00256-0.
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.
磷趾海蜷的每只足神经节都含有一群 5-9 个具有血清素免疫反应的神经元，这些神经元被证明可以调节翼状附肢的慢肌收缩，并有助于游泳加速。左右神经节之间没有明显的差异。在电生理记录和随后的染料注射（羧基荧光素）实验中，发现这些簇包含两个神经元亚群。大多数神经元通过神经 n4 支配同侧的翼。每个簇中的两个神经元通过神经 n3 和 n8 将轴突送出足神经节。神经 n3 中的轴突支配颈部区域的体壁，而神经 n8 中的轴突支配尾部的体壁。两个神经元亚群的基线电生理活动不同，“翼”神经元有持续的小突触活动，而“体壁”神经元的突触输入较少。讨论了 Pd-SW 簇在游泳加速（翼神经元）和控制身体和翼血腔隔间内的流体压力（体壁神经元）方面的潜在作用。
