Structural modularity and grid activity in the medial entorhinal cortex.

Structural modularity and grid activity in the medial entorhinal cortex.
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内侧内嗅皮层的结构模块化和网格活动。

DOI:
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发表时间:
2018
影响因子:
2.5
通讯作者:
Andrea Burgalossi
Andrea Burgalossi
中科院分区:
医学3区
文献类型:
--
作者:
R. Naumann;Patricia Preston;M. Brecht;Andrea Burgalossi

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随着网格细胞的突破性发现,内侧内嗅皮层(MEC)已成为大量解剖学、生理学和计算机研究的焦点。网格活动是否以及如何映射到细胞类型和大脑皮层结构仍然是一个悬而未决的问题。在微电路、功能和连通性方面的基本相似之处表明,啮齿动物的MEC和人类后内侧内嗅皮层之间存在同源性。两者都专门用于空间处理,并显示出相似的细胞组织,由重叠在散布的星状神经元上的第二层锥体/钙结合蛋白细胞斑块组成。最近的数据表明,在MEC浅层内还存在一个不重叠的模块系统(锌斑块)。锌和钙结合蛋白斑块已被证明接受来自丘前和副丘脑的大部分分离的输入。网格细胞也聚集在MEC中,我们讨论了网格活动如何映射到大脑皮层贴片系统的可能的结构-功能方案。我们假设,在MEC的浅层,解剖位置可以预测功能;因此,将功能属性和神经元形态与皮质模块联系起来,对于解析网格活动如何映射到皮质结构是必要的。为了验证这一假说,需要对自由活动的动物进行成像或细胞鉴定。
Following the groundbreaking discovery of grid cells, the medial entorhinal cortex (MEC) has become the focus of intense anatomical, physiological, and computational investigations. Whether and how grid activity maps onto cell types and cortical architecture is still an open question. Fundamental similarities in microcircuits, function, and connectivity suggest a homology between rodent MEC and human posteromedial entorhinal cortex. Both are specialized for spatial processing and display similar cellular organization, consisting of layer 2 pyramidal/calbindin cell patches superimposed on scattered stellate neurons. Recent data indicate the existence of a further nonoverlapping modular system (zinc patches) within the superficial MEC layers. Zinc and calbindin patches have been shown to receive largely segregated inputs from the presubiculum and parasubiculum. Grid cells are also clustered in the MEC, and we discuss possible structure-function schemes on how grid activity could map onto cortical patch systems. We hypothesize that in the superficial layers of the MEC, anatomical location can be predictive of function; thus relating functional properties and neuronal morphologies to the cortical modules will be necessary for resolving how grid activity maps onto cortical architecture. Imaging or cell identification approaches in freely moving animals will be required for testing this hypothesis.
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