The laminar distribution of macaque tectobulbar and tectospinal neurons.
The laminar distribution of macaque tectobulbar and tectospinal neurons.
复制标题
猕猴顶盖球和顶盖脊髓神经元的层状分布。
DOI：
10.1017/s0952523800002911
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发表时间：
1992
影响因子：
1.9
通讯作者：
Porter,JD
中科院分区：
文献类型：
--
作者：
May,PJ;Porter,JD
上级丘通过其向脑干和脊髓的下行投射对定向运动施加最直接的影响，特别是扫视。然而，虽然有详细的生理数据关于灵长类动物上级丘的眼跳相关活动的产生，有相对较少的数据，在灵长类动物的详细连接，这个结构。因此，利用逆行转运技术来确定猕猴中这些下行通路的起源细胞的位置。投射到同侧脑桥网状结构的顶盖细胞主要分布在深灰质层，偶尔也分布在中间灰质层。投射到对侧脑桥网状结构的顶盖细胞主要位于中间灰质层。对侧投射的人群可分为两组。中间灰质层上亚板层的细胞主要投射到旁正中网状结构的眼跳相关区域。下亚板层的细胞主要投射到脑桥网状结构的更外侧区域和脊髓。我们的结论是，灵长类动物丘提供了至少三个下行输出通道，这是可能不同的连接和功能。具体来说，中间灰层的下部似乎可能专门用于支持头部和眼睛的联合定向运动，而上部亚板层则支持眼跳。
The superior colliculus exerts its most direct influence over orienting movements, and saccades in particular, via its descending projections to the brain stem and spinal cord. However, while there is detailed physiological data concerning the generation of saccade-related activity in the primate superior colliculus, there is relatively little data on the detailed connectivity of this structure in primates. Consequently, retrograde transport techniques were utilized to determine the locations of the cells of origin of these descending pathways in macaque monkeys. Tectal cells that projected to the ipsilateral pontine reticular formation were mainly found in the deep gray layer and occasionally in the intermediate gray layer. Tectal cells that projected to the contralateral pontine reticular formation were predominantly located in the intermediate gray layer. The contralaterally projecting population could be subdivided into two groups. The cells in upper sublamina of the intermediate gray layer project primarily to the saccade-related regions of the paramedian reticular formation. Cells in the lower sublamina project primarily to more lateral regions of the pontine reticular formation and to the spinal cord. We conclude that the primate colliculus is provided with at least three descending output channels, which are likely to differ in their connections and functions. Specifically, it seems likely that the lower portion of the intermediate gray layer may be specialized to subserve combined head and eye orienting movements, while the upper sublamina subserves saccades.