A new ascending sensory tract to the calyces of the honeybee mushroom, body, the subesophageal-calycal tract
A new ascending sensory tract to the calyces of the honeybee mushroom, body, the subesophageal-calycal tract
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DOI：
10.1002/cne.10843
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发表时间：
2003-10-13
影响因子：
2.5
通讯作者：
Menzel, R
中科院分区：
文献类型：
--
作者：
Schröter, U;Menzel, R
蜜蜂的蘑菇体是学习和记忆的重要神经柱。因此，了解它们的输入和输出连接对于理解这些神经柱如何发挥作用至关重要。本文提出了一种新的蘑菇体输入束，称为食管下盏束（SCT），它连接食管下神经节和蘑菇体的盏。SCT神经元的神经元胞体位于视叶小叶和由tritcerebrum和食管下神经节融合形成的神经节区域之间的一个簇中。在食管下神经节内，SCT神经元的树突状纤维与来自吻的感觉神经元的终末重叠。因此，我们的结论是，SCT神经元可能处理味觉和机械感觉信息的吻。个体SCT神经元在食管下神经节内接受单侧输入，并且可以连接到同侧或对侧蘑菇体。在它们到达蘑菇体的途中，SCT神经元轴突与触角脑束（ACT）的根部相遇，并从这一点沿着与中间ACT神经元相同的路径行进一段短距离。在肾盏内，SCT神经元支配两个独立的区域，唇下方的背领内的一个小区域和基底环的一部分。双标记实验表明，SCT神经元的投射与延髓背侧的嗅觉投射神经元和视觉投射神经元的投射不重叠。本文还讨论了SCT神经元的可能功能以及SCT与其他昆虫蘑菇体的已知输入通道的关系。(C)2003 Wiley-Liss，Inc.
The mushroom bodies of the honeybee are important neuropils for learning and memory. Therefore, knowledge about their input and output connections is essential to understanding how these neuropils function. A newly described input tract to the mushroom body is presented here, which is called the subesophageal-calycal tract (SCT) and connects the subesophageal ganglion with the calyces of the mushroom bodies. The neuronal somata of the SCT neurons lie in one cluster between the lobula of the optic lobe and a neuropil area that is formed from the fusion of the tritocerebrum and the subesophageal ganglion. Within the subesophageal ganglion, the dendritic fibers of SCT neurons overlap with terminals of sensory neurons from the proboscis. Therefore, we conclude that the SCT neurons might process gustatory and mechanosensory information from the proboscis. Individual SCT neurons receive unilateral input within the subesophageal ganglion and may connect to either the ipsilateral or the contralateral mushroom body. On their way to the mushroom bodies, the SCT neuron axons meet the roots of the antennocerebralis tracts (ACTs) and from this point follow the same path as the median ACT neurons for a short distance. Within the calyces, the SCT neurons innervate two separate areas, a small area within the dorsal collar just below the lip and a part of the basal ring. Double-labeling experiments show that the projections of the SCT neurons do not overlap with the projections of the olfactory projection neurons and visual projection neurons from the dorsal medulla. The possible function of the SCT neurons and the relation of the SCT to known input tracts of the mushroom bodies in other insects are discussed. (C) 2003 Wiley-Liss, Inc.