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首页> 外文期刊>The European Journal of Neuroscience >Mesencephalic and diencephalic afferent connections to the thalamic nucleus rotundus in the lizard, Psammodromus algirus.
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Mesencephalic and diencephalic afferent connections to the thalamic nucleus rotundus in the lizard, Psammodromus algirus.

机译：中脑和中脑传入连接到丘脑丘脑核在蜥蜴，Psammodromus阿尔及鲁斯。

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The present work is an analysis of the afferent projections to the thalamic nucleus rotundus in a lizard, both at the light- and electron-microscopic level, using biotinylated dextran amine (BDA) as a neuroanatomical tracer. This study has confirmed previously reported afferent projections to nucleus rotundus in reptiles and has also identified a number of new cellular aggregates projecting to this dorsal thalamic nucleus. After BDA injections into nucleus rotundus, retrogradely labelled neurons were observed consistently within the following neuronal groups in the midbrain and the diencephalon: (i) the stratum griseum centrale of the optic tectum; (ii) the nucleus subpretectalis in the pretectum; (iii) the nucleus ansa lenticularis posterior, the posterior nucleus of the ventral supraoptic commissure, and the posteroventral nucleus, in the dorsal thalamus and (iv) the lateral suprachiasmatic nucleus and part of the reticular complex in the ventral thalamus. Tectal axons entering nucleus rotundus were fine and varicose and formed exclusively asymmetric synaptic contacts, mainly on small dendritic profiles. Rotundal neurons had symmetric synapses made by large boutons probably of nontectal origin. After comparing our results with those in other reptiles, birds and mammals, we propose that the sauropsidian nucleus rotundus forms part of a visual tectofugal pathway that conveys mesencephalic visual information to the striatum and dorsal ventricular ridge, and is similar to the mammalian colliculo-posterior/intralaminar-striatoamygdaloid pathway, the function of which may be to participate in visually guided behaviour.
机译：目前的工作是使用生物素化的葡聚糖胺（BDA）作为神经解剖示踪剂，在光镜和电镜下对蜥蜴丘脑核的传入突起进行分析。这项研究证实了以前报道的爬行动物中圆形核传入传入的预测，并且还鉴定了许多投射到该丘脑背侧核的新细胞聚集体。在将BDA注射到圆形核后，在中脑和间脑的以下神经元组中一致地观察到了逆行标记的神经元：（i）视神经中枢的灰质中央层; （ii）直肠前核中的直肠下核; （iii）背丘脑后核，后视上腹后核和后腹核，以及（iv）眼睑上外侧眼核和腹侧丘脑网状复合体的一部分。进入圆形圆形核的直肠轴突细而曲张，仅形成不对称的突触接触，主要在小的树突状分布上。圆形神经元具有对称的突触，突触可能是由非接触起源的大钮扣产生的。在将我们的结果与其他爬行动物，鸟类和哺乳动物的研究结果进行比较之后，我们提出轮趾龙核构成了视神经的顶入途径，该途径将中脑的视觉信息传递到纹状体和背侧心室脊，并且类似于哺乳动物的后壁/ intralaminar-striatoamygdaloid途径，其功能可能是参与视觉引导的行为。

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