Sources of somatosensory input to the caudal belt areas of auditory cortex
Sources of somatosensory input to the caudal belt areas of auditory cortex
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DOI：
10.1068/p5841
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发表时间：
2007-01-01
期刊：
影响因子：
1.7
通讯作者：
Schroeder, Charles E.
中科院分区：
文献类型：
--
作者：
Hackett, Troy A.;Smiley, John F.;Schroeder, Charles E.
非人类灵长类动物的听觉皮层由至少12个相互连接的区域组成，分布在上级颞回的三个主要区域：核心、带状和副脑回。个别地区的基础上区分独特的配置文件，包括架构功能，丘脑和皮层的连接，神经元的反应特性。最近在尾内侧（CM）和尾外侧（CL）带区域的会聚性神经-躯体感觉相互作用的演示促使我们进行解剖学研究，以确定听觉皮层的躯体输入源。皮质皮质和丘脑皮质的连接，揭示了注射神经解剖示踪剂到CM，CL，和相邻领域的绒猴（Callithrix jacchus jacchus）和猕猴（猕猴）猴子。除了听觉皮层外，CM和CL的皮层连接还包括躯体感觉区（岛后区，Ri;颗粒区，IG）和多感觉区（颞顶枕区，颞顶颞区）。丘脑输入包括内侧膝状体复合体和几个多感觉核（上膝状体，后，limitans，内侧枕），但不是腹后复合体。注射的核心（铝，R）和rostromedial区的听觉皮层显示稀疏的多感觉连接。结果提示，Ri区和IG区是向尾侧带提供躯体感觉输入的主要来源，而皮层和丘脑的多感觉区也可能有贡献。目前的数据增加了越来越多的证据表明，多感觉会聚在皮质区以前被认为是“单峰”，也表明，听觉皮质区在这方面有所不同。
The auditory cortex of nonhuman primates is comprised of a constellation of at least twelve interconnected areas distributed across three major regions on the superior temporal gyrus: core, belt, and parabelt. Individual areas are distinguished on the basis of unique profiles comprising architectonic features, thalamic and cortical connections, and neuron response properties. Recent demonstrations of convergent auditory-somatosensory interactions in the caudomedial (CM) and caudolateral (CL) belt areas prompted us to pursue anatomical studies to identify the source(s) of somatic input to auditory cortex. Corticocortical and thalamocortical connections were revealed by injecting neuroanatomical tracers into CM, CL, and adjoining fields of marmoset (Callithrix jacchus jacchus) and macaque (Macaca mulatta) monkeys. In addition to auditory cortex, the cortical connections of CM and CL included somatosensory (retroinsular, Ri; granular insula, Ig) and multisensory areas (temporal parietal occipital, temporal parietal temporal). Thalamic inputs included the medial geniculate complex and several multisensory nuclei (supra-geniculate, posterior, limitans, medial pulvinar), but not the ventroposterior complex. Injections of the core (Al, R) and rostromedial areas of auditory cortex revealed sparse multisensory connections. The results suggest that areas Ri and Ig are the principle sources of somatosensory input to the caudal belt, while multisensory regions of cortex and thalamus may also contribute. The present data add to growing evidence of multisensory convergence in cortical areas previously considered to be 'unimodal', and also indicate that auditory cortical areas differ in this respect.