Neuronal morphology in subdivisions of the inferior colliculus of chicken (Gallus gallus)
Neuronal morphology in subdivisions of the inferior colliculus of chicken (Gallus gallus)
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DOI：
10.1016/j.jchemneu.2012.03.004
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发表时间：
2012-05-01
影响因子：
2.8
通讯作者：
Luksch, Harald
中科院分区：
文献类型：
--
作者：
Niederleitner, Bertram;Luksch, Harald
鸟类下丘（IC），也被称为中脑外侧背部核（MLd），是一种听觉中脑核，它将来自神经局部组织的脑干核的听觉信号聚合在一起。这个信息一方面传递到视顶盖，另一方面传递到卵泡核。在形态学上，关于IC内亚核的数量和命名一直存在相当大的争议。在这里，我们提供了五个鸡IC亚核中单个细胞的形态学特征。采用全细胞贴片技术和生物细胞素离子电泳技术对其细胞结构进行了研究。此外，我们进行了组织学染色，以划定IC亚核之间的边界。我们能够区分5个亚核：中央核的核心（ICCc），中央核的内侧和外侧壳（ICCms和ICCls），外核（ICX）和IC的浅核（ICS）。我们的发现表明至少存在两种不同形态的神经元，每种神经元有两种亚型。就细胞水平上的神经元解剖而言，鸡的IC在很大程度上是同质核。然而，它被划分成不同的亚核，具有不同的神经生理特征，这表明听觉信息的处理系统是复杂的。鸡的听觉系统不像像仓鸮这样的专家那样肥大，但似乎具有类似的连通性和细胞形态。(C) 2012 Elsevier B.V.版权所有
The avian inferior colliculus (IC), also referred to as the nucleus mesencephalicus lateralis pars dorsalis (MLd), is an auditory midbrain nucleus that converges auditory cues from tonotopically organized brainstem nuclei. This information is relayed onto the optic tectum on the one hand and to nucleus ovoidalis on the other hand. Morphologically, there has been considerable debate about the number and nomenclature of the subnuclei within the IC. Here, we provide morphological characteristics of single cells in five IC subnuclei in chicken.The cellular structure within the IC was studied by whole-cell patch technique and biocytin iontophoresis. In addition, histological staining was performed, to delineate the borders between subnuclei of the IC. We were able to discriminate between 5 subnuclei: the core of the central nucleus (ICCc), the medial and lateral shell of the central nucleus (ICCms and ICCls), the external nucleus (ICX) and the superficial nucleus (ICS) of the IC. Our findings suggest the existence of at least two different morphologies of neurons with two subtypes each.The IC in chicken is a largely homogenous nucleus in terms of neuronal anatomy on a cellular level. However, its compartmentation into diversified subnuclei with different neurophysiological characteristics suggests a complex system to process auditory information. The auditory system in chicken is not as hypertrophied as in specialists such as the barn owl, but appears to have comparable connectivity and cellular morphology. (C) 2012 Elsevier B.V. All rights reserved.