Nucleus Ruber of Actinopterygians
Nucleus Ruber of Actinopterygians
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放线鱼红核
DOI：
10.1159/000447442
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
N.
中科院分区：
文献类型：
--
作者：
Nakayama;T.;Miyajima;S.;Nishino;A.;Narita;J.;Abe;H.;Yamamoto;N.
红核是四足动物控制前肢运动的重要脊髓上中枢，红核同源物在鱼类中可能具有类似的功能（胸鳍的运动控制）。然而，两个明显不同的结构已被确定为'核红'在放线菌。一个是Goldstein（1905）的红核（NRg），另一个是Nieuwenhuys和Pouwels（1983）的红核（NRnp）。目前还不清楚这些细胞核中的一个（或者两个）是否与四足动物的红核同源。为了解决这个问题，从系统发育的角度来看，我们已经调查了分布的背盖神经元逆行标记的脊髓在八个actinopterygian物种。我们还调查了存在/不存在的两个核与Nissl或Bodian染色的脑切片系列的另外28个actinopterygian物种通过比较候选红核神经元的形态特征与示踪剂研究所揭示的神经元。基于这些分析，NRg被确定在本研究中调查的所有放线菌，而NRNP似乎是不存在的基础放线菌。系统发育分布模式表明，NRg更可能是红核的同源物，NRnp可能是在辐鳍类进化过程中出现的衍生核。
Nucleus ruber is known as an important supraspinal center that controls forelimb movements in tetrapods, and the rubral homologue may serve similar functions in fishes (motor control of pectoral fin). However, two apparently different structures have been identified as ‘nucleus ruber'in actinopterygians. One is nucleus ruber of Goldstein (1905)(NRg), and the other nucleus ruber of Nieuwenhuys and Pouwels (1983)(NRnp). It remains unclear whether one of these nuclei (or perhaps both) is homologous to tetrapod nucleus ruber. To resolve this issue from a phylogenetic point of view, we have investigated the distribution of tegmental neurons retrogradely labeled from the spinal cord in eight actinopterygian species. We also investigated the presence/absence of the two nuclei with Nissl-or Bodian-stained brain section series of an additional 28 actinopterygian species by comparing the morphological features of candidate rubral neurons with those of neurons revealed by the tracer studies. Based on these analyses, the NRg was identified in all actinopterygians investigated in the present study, while the NRnp appears to be absent in basal actinopterygians. The phylogenetic distribution pattern indicates that the NRg is the more likely homologue of nucleus ruber, and the NRnp may be a derived nucleus that emerged during the course of actinopterygian evolution.