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Organization of the inferotemporal cortex in the macaque monkey: Connections of areas PITv and CITvp.

机译：猕猴下颞皮质的组织：PITv和CITvp区域的连接。

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摘要

Visual cortex of macaque monkeys consists of a large number of cortical areas that span the occipital, parietal, temporal, and frontal lobes and occupy more than half of cortical surface. Although considerable progress has been made in understanding the contributions of many occipital areas to visual perceptual processing, much less is known concerning the specific functional contributions of higher areas in the temporal and frontal lobes. Previous behavioral and electrophysiological investigations have demonstrated that the inferotemporal cortex (IT) is essential to the animal's ability to recognize and remember visual objects. While it is generally recognized that IT consists of a number of anatomically and functionally distinct visual-processing areas, there remains considerable controversy concerning the precise number, size, and location of these areas. Therefore, the precise delineation of the cortical subdivisions of inferotemporal cortex is critical for any significant progress in the understanding of the specific contributions of inferotemporal areas to visual processing. In this study, anterograde and/or retrograde neuroanatomical tracers were injected into two visual areas in the ventral posterior and central portions of IT (areas PITv and CITvp) to elucidate the corticocortical connections of these areas with well known areas of occipital cortex and with less well understood regions of inferotemporal cortex. The locations of injection sites and the delineation of the borders of many occipital areas were aided by the pattern of interhemispheric connections, revealed following callosal transection and subsequent labeling with HRP. The resultant patterns of connections were represented on two-dimensional computational (CARET) and manual cortical maps and the laminar characteristics and density of the projection fields were quantified. The laminar and density features of these corticocortical connections demonstrate thirteen anatomically distinct subdivisions or areas distributed within the superior temporal sulcus and across the inferotemporal gyrus. These results serve to refine previous descriptions of inferotemporal areas, validate recently identified areas, and provide a new description of the hierarchical relationships among occipitotemporal cortical areas in macaques.
机译：猕猴的视觉皮层由大量皮质区域组成，这些区域跨越枕叶，顶叶，颞叶和额叶，并占据了皮质表面的一半以上。尽管在理解许多枕骨区域对视觉感知过程的贡献方面已取得了很大进展，但对于颞叶和额叶较高区域的特定功能贡献，人们所知甚少。先前的行为和电生理研究表明，颞下皮质（IT）对于动物识别和记忆视觉对象的能力至关重要。尽管通常认为IT由许多在解剖学和功能上均不同的视觉处理区域组成，但有关这些区域的确切数量，大小和位置仍存在相当多的争议。因此，对颞下皮质皮层细分的精确描绘对于理解颞下区域对视觉处理的特定贡献的任何重大进展至关重要。在这项研究中，将顺行和/或逆行神经解剖示踪剂注射到IT腹侧后部和中部的两个视觉区域（区域PITv和CITvp），以阐明这些区域与枕叶皮质的已知区域和较少区域的皮层连接颞下皮质区域。半球间连接的模式有助于注射部位的定位和许多枕骨区域边界的勾画，在call骨横切和随后用HRP标记后显示。所得的连接模式在二维计算（CARET）和手动皮质图上表示，并量化了层流特征和投影场的密度。这些皮层皮质连接的层流和密度特征表明，在颞上沟内和颞下回之间分布着13个解剖学上不同的细分或区域。这些结果有助于完善以前的颞下区域的描述，验证最近发现的区域，并提供猕猴的枕颞皮质区域之间的等级关系的新描述。

著录项

  • 作者

    McClendon, Evelyn.;

  • 作者单位

    The University of Texas Graduate School of Biomedical Sciences at Houston.;

  • 授予单位 The University of Texas Graduate School of Biomedical Sciences at Houston.;
  • 学科 Biology Neuroscience.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 147 p.
  • 总页数 147
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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