Segregation of visual input to the mushroom bodies in the honeybee (Apis mellifera)
Segregation of visual input to the mushroom bodies in the honeybee (Apis mellifera)
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DOI：
10.1002/cne.10355
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发表时间：
2002-09-30
影响因子：
2.5
通讯作者：
Gronenberg, W
中科院分区：
文献类型：
--
作者：
Ehmer, B;Gronenberg, W
昆虫蘑菇体是接受多感官输入的大脑区域，被认为在学习和记忆中发挥重要作用。在大多数新翅目昆虫中，蘑菇体直接接收嗅觉输入。此外，Hytera的花萼接收来自视叶的大量直接输入。我们描述了视觉输入的蜜蜂的蘑菇体的花萼，神经元的树突领域的视叶，髓质和小叶，和他们的终端在花萼的组织。延髓神经元终止于肾盏的领区，在那里它们分成五层，分别从背侧或腹侧延髓接收交替输入。项圈的第六层，也就是最内层，接收来自小叶神经元的输入。在肾盏的基底环区域，髓质神经元终末局限于一个小的远端部分。小叶神经元在基底环中更突出，在那里它们终止于其外半部。虽然颈环和基底环层通常接收来自两个视神经柱的隔离输入，但在层的边界处发生一些重叠。至少有三种不同类型的蘑菇体输入神经元起源于延髓：（a）具有狭窄树突野的神经元，主要局限于延髓的蛇形层附近，并在整个延髓中发现：（B）局限于延髓腹侧半部分的神经元，其特征是外髓质中的长柱状树突分支;和（c）一组神经元，其树突局限于髓质的最腹侧部分，并且其轴突形成前下视束。大多数髓质神经元（a组和B组）通过前上级视束将其轴突发送到蘑菇体。连接小叶与蘑菇体的神经元在小叶的确定的背侧部分具有树突。它们的轴突形成了蘑菇体的第三个通道，这里称为小叶通道。我们的研究结果与内在蘑菇体神经元的解剖结构相匹配（Strausfeld，2002），并共同表明蘑菇体可能由比以前提出的更多的功能子系统组成。(C)2002 Wiley-Liss，Inc.
Insect mushroom bodies are brain regions that receive multisensory input and are thought to play an important role in learning and memory. In most neopteran insects, the mushroom bodies receive direct olfactory input. In addition, the calyces of Hymenoptera receive substantial direct input from the optic lobes. We describe visual inputs to the calyces of the mushroom bodies of the honeybee Apis mellifera, the neurons' dendritic fields in the optic lobes, the medulla and lobula, and the organization of their terminals in the calyces. Medulla neurons terminate in the collar region of the calyx, where they segregate into five layers that receive alternating input from the dorsal or ventral medulla, respectively. A sixth, innermost layer of the collar receives input from lobula neurons. In the basal ring region of the calyx, medulla neuron terminals are restricted to a small, distal part. Lobula neurons are more prominent in the basal ring, where they terminate in its outer half. Although the collar and basal ring layers generally receive segregated input from both optic neuropils, some overlap occurs at the borders of the layers. At least three different types of mushroom body input neurons originate from the medulla: (a) neurons with narrow dendritic fields mainly restricted to the vicinity of the medulla's serpentine layer and found throughout the medulla; (b) neurons restricted to the ventral half of the medulla and featuring long columnar dendritic branches in the outer medulla; and (c) a group of neurons whose dendrites are restricted to the most ventral part of the medulla and whose axons form the anterior inferior optic tract. Most medulla neurons (groups a and b) send their axons via the anterior superior optic tract to the mushroom bodies. Neurons connecting the lobula with the mushroom bodies have their dendrites in a defined dorsal part of the lobula. Their axons form a third tract to the mushroom bodies, here referred to as the lobula tract. Our findings match the anatomy of intrinsic mushroom body neurons (Strausfeld, 2002) and together indicate that the mushroom bodies may be composed of many more functional subsystems than previously suggested. (C) 2002 Wiley-Liss, Inc.