Neuroanatomy of the lumbosacral plexus in a highly diversified clade of South-American lizards. Evolution and phylogenetic implications,Journal of Morphology

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Neuroanatomy of the lumbosacral plexus in a highly diversified clade of South-American lizards. Evolution and phylogenetic implications
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-06-29 , DOI: 10.1002/jmor.21226
Angel Matías Quipildor ₁ , Andrés Sebastián Quinteros _{1,

2} , Fernando José Lobo _{1,

3}

Affiliation

Only few published studies that describe the neuroanatomy of lizards. Here, we describe the neuroanatomy of several Iguanian species belonging to three families (species of Liolaemus and Phymaturus belonging to Liolaemidae, Tropidurus and Stenocercus as representatives of Tropiduridae, and Diplolaemus as a representative of Leiosauridae). Based on Sudan Black B staining and conventional dissections, the neuroanatomy of the lumbosacral region is described. Among the most outstanding results is the existence of a neuronal pattern of the lumbosacral plexus characteristic of Liolaemidae. In addition, it was found that in the genus Liolaemus the lumbosacral plexus is composed of five pairs of spinal nerves while in Phymaturus, Tropidurus, Stenocercus and Diplolaemus is composed from five to six pairs of spinal nerves (from pre‐sacral, sacral, and caudal vertebrae). We find differences in the origin of the spinal nerves that constitute the plexus. In some cases, the pattern of nerves involved includes even the caudal vertebrae. Variation among taxa related to the zeugopodial innervation is described, and the homology of these nervous branches is discussed. Sexual differences were found in some species studied. Based on our results and available literature, we found three different patterns of innervation of the zeugopodium. The major contribution of this study is to provide a detailed description of lumbosacral plexus nerves pathways from their origins at the vertebral column to the muscles that they innervate.

中文翻译：

南美蜥蜴高度多样化进化枝中腰骶丛的神经解剖学。进化和系统发育意义

只有少数已发表的研究描述了蜥蜴的神经解剖学。在这里，我们描述了属于三个科的几种鬣蜥物种的神经解剖结构（属于 Liolaemidae 的 Liolaemus 和 Phymaturus，Tropidurus 和 Stenocercus 作为 Tropiduridae 的代表，Diplolaemus 作为 Leiosauridae 的代表）。基于苏丹黑 B 染色和常规解剖, 描述了腰骶区的神经解剖学。最突出的结果之一是存在着狮子科动物特有的腰骶丛神经元模式。此外，还发现 Liolaemus 属的腰骶丛由 5 对脊神经组成，而在 Phymaturus、Tropidurus、Stenocercus 和 Diplolaemus 中由 5-6 对脊神经（从前骶、骶、和尾椎）。我们发现构成神经丛的脊神经起源不同。在某些情况下，所涉及的神经模式甚至包括尾椎。描述了与 zeugopodial 神经支配相关的分类群之间的变异，并讨论了这些神经分支的同源性。在研究的一些物种中发现了性别差异。根据我们的结果和现有文献，我们发现了 zeugopodium 的三种不同的神经支配模式。这项研究的主要贡献是详细描述了腰骶丛神经通路，从它们在脊柱的起源到它们所支配的肌肉。描述了与 zeugopodial 神经支配相关的分类群之间的变异，并讨论了这些神经分支的同源性。在研究的一些物种中发现了性别差异。根据我们的结果和现有文献，我们发现了 zeugopodium 的三种不同的神经支配模式。这项研究的主要贡献是详细描述了腰骶丛神经通路，从它们在脊柱的起源到它们所支配的肌肉。描述了与 zeugopodial 神经支配相关的分类群之间的变异，并讨论了这些神经分支的同源性。在研究的一些物种中发现了性别差异。根据我们的结果和现有文献，我们发现了 zeugopodium 的三种不同的神经支配模式。这项研究的主要贡献是详细描述了腰骶丛神经通路，从它们在脊柱的起源到它们所支配的肌肉。

更新日期：2020-06-29

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