Comparative Studies of Diurnal and Nocturnal Rodents: Differences in Lifestyle Result in Alterations in Cortical Field Size and Number
Comparative Studies of Diurnal and Nocturnal Rodents: Differences in Lifestyle Result in Alterations in Cortical Field Size and Number
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DOI：
10.1002/cne.22466
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发表时间：
2010-11-15
影响因子：
2.5
通讯作者：
Krubitzer, Leah
中科院分区：
文献类型：
--
作者：
Campi, Katharine L.;Krubitzer, Leah
在这项研究中，我们检查和描述的感觉皮层的神经解剖组织在四种啮齿动物：实验室挪威大鼠（长埃文斯;褐家鼠），野生捕获的挪威大鼠（褐家鼠），野生捕获的加州地松鼠（Spermophilus beecheyi），和野生捕获的东部灰松鼠（松鼠carolinensis）。具体来说，我们检查了视觉皮层（17、18和19区）、体感皮层（51区、S2区和PV区）和听觉皮层（A1 + AAF（R）区和TA区）中几个明确区域的骨髓结构和细胞色素氧化酶反应性，并比较了这些区域的背外侧皮层百分比。我们的研究结果表明，松鼠有一个更大的平均百分比的背外侧皮层专门用于视觉领域比大鼠。这种差异是由于17区和18区等已知区域所占的皮质比例更大，而不仅仅是视觉区域数量的差异，这最终使这种区别更加明显。此外，两组大鼠的背外侧皮层中，有较大比例的区域用于躯体感觉和听觉皮层。还观察到组内差异。树栖松鼠有一个较大的平均百分比的背外侧皮层致力于区域17和18相比，陆地松鼠。实验室挪威大鼠有较大比例的背外侧皮质致力于躯体感觉和听觉领域比野生捕获的挪威大鼠。我们的研究结果表明，感觉器官，感觉系统的使用和生态位的差异反映在组织和皮质区的大小。J. Comp.神经元518：4491-4512，2010. (C)2010 Wiley-Liss，Inc.
In this study we examine and describe the neuroanatomical organization of sensory cortex in four rodents: laboratory Norway rats (Long Evans; Rattus norvegicus), wild-caught Norway rats (Rattus norvegicus), wild-caught California ground squirrels (Spermophilus beecheyi), and wild-caught Eastern gray squirrels (Sciurus carolinensis). Specifically, we examined the myeloarchitecture and cytochrome oxidase reactivity for several well-identified areas in visual cortex (areas 17, 18, and 19), somatosensory cortex (areas 51, S2 and PV), and auditory cortex [areas A1 + AAF (R) and TA] and compared the percentage of dorsolateral cortex devoted to each of these areas. Our results demonstrate that squirrels have a larger mean percentage of dorsolateral cortex devoted to visual areas than rats. The difference is due to the greater percentage of cortex devoted to known areas such as area 17 and area 18 and not simply to a difference in the number of visual areas, which ultimately makes this distinction even more pronounced. Furthermore, both rat groups have a larger percentage of the dorsolateral cortex devoted to somatosensory and auditory cortical areas. Differences within groups were also observed. The arboreal squirrel had a larger mean percentage of dorsolateral cortex devoted to areas 17 and 18 compared with the terrestrial squirrel. The laboratory Norway rat had a larger percentage of dorsolateral cortex devoted to both somatosensory and auditory areas than the wild-caught Norway rat. Our results indicate that differences in sensory apparatus, use of sensory systems, and niche are reflected in the organization and size of cortical areas. J. Comp. Neurol. 518:4491-4512, 2010. (C) 2010 Wiley-Liss, Inc.