Comparative neuroanatomy suggests repeated reduction of neuroarchitectural complexity in Annelida.
Comparative neuroanatomy suggests repeated reduction of neuroarchitectural complexity in Annelida.
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DOI：
10.1186/1742-9994-7-13
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发表时间：
2010-05-04
影响因子：
2.8
通讯作者：
Loesel R
中科院分区：
文献类型：
--
作者：
Heuer CM;Müller CH;Todt C;Loesel R
成对的蘑菇体，不成对的中央复合体，和双侧排列的嗅球簇是节肢动物神经结构中最具特色的组成部分。蘑菇体neuropils，不成对的中线neuropils，和嗅球也发生在一些多毛类环节动物的大脑，显示出不同程度的形态相似的节肢动物同行。由于环节动物系统发育知识不完整以及缺乏该群体的比较神经解剖学数据，试图阐明这些神经柱的进化起源并推导环节动物大脑复杂性的祖先基础模式受到阻碍。本帐户的目的是提供新的形态学数据的范围广泛的环节动物类群，以跟踪更高的脑中心的发生和变异的分段蠕虫。免疫组织化学染色的制剂提供了比较神经解剖数据的代表22环节动物物种。环节动物脑中最突出的神经元结构是在许多多毛类动物中出现的成对蘑菇体。在某些情况下，蘑菇体可以被证明与球状神经乳头簇密切相关，让人想起节肢动物的嗅觉小球。环节动物大脑的不太明显的亚室是不成对的中线神经柱，它们与节肢动物大脑中的类似成分有着遥远的相似之处。更高的大脑中心，如蘑菇体，嗅球，和不成对的中线神经末梢的发生似乎仅限于错误的多毛类。假定环节动物和节肢动物蘑菇体之间的同源性的影响进行了讨论，在光的“新的动物生殖”。它的结论是蘑菇机构在远亲群体的明显同源性被解释为一个plesiomorphy，指向一个相当复杂的神经结构继承了最后的共同祖先，Urbilateria。在环节动物的辐射，缺乏蘑菇体在某些群体的解释是广泛的二次减少，由于选择压力不利于复杂的大脑的分化。迷走性多毛类动物中蘑菇体神经柱的进化途径仍然是个谜。
Paired mushroom bodies, an unpaired central complex, and bilaterally arranged clusters of olfactory glomeruli are among the most distinctive components of arthropod neuroarchitecture. Mushroom body neuropils, unpaired midline neuropils, and olfactory glomeruli also occur in the brains of some polychaete annelids, showing varying degrees of morphological similarity to their arthropod counterparts. Attempts to elucidate the evolutionary origin of these neuropils and to deduce an ancestral ground pattern of annelid cerebral complexity are impeded by the incomplete knowledge of annelid phylogeny and by a lack of comparative neuroanatomical data for this group. The present account aims to provide new morphological data for a broad range of annelid taxa in order to trace the occurrence and variability of higher brain centers in segmented worms. Immunohistochemically stained preparations provide comparative neuroanatomical data for representatives from 22 annelid species. The most prominent neuropil structures to be encountered in the annelid brain are the paired mushroom bodies that occur in a number of polychaete taxa. Mushroom bodies can in some cases be demonstrated to be closely associated with clusters of spheroid neuropils reminiscent of arthropod olfactory glomeruli. Less distinctive subcompartments of the annelid brain are unpaired midline neuropils that bear a remote resemblance to similar components in the arthropod brain. The occurrence of higher brain centers such as mushroom bodies, olfactory glomeruli, and unpaired midline neuropils seems to be restricted to errant polychaetes. The implications of an assumed homology between annelid and arthropod mushroom bodies are discussed in light of the 'new animal phylogeny'. It is concluded that the apparent homology of mushroom bodies in distantly related groups has to be interpreted as a plesiomorphy, pointing towards a considerably complex neuroarchitecture inherited from the last common ancestor, Urbilateria. Within the annelid radiation, the lack of mushroom bodies in certain groups is explained by widespread secondary reductions owing to selective pressures unfavorable for the differentiation of elaborate brains. Evolutionary pathways of mushroom body neuropils in errant polychaetes remain enigmatic.
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影响因子：
2.6
作者：
Bullock, TH
通讯作者：
Bullock, TH
影响因子：
2.6
作者：
Harzsch, S
通讯作者：
Harzsch, S
影响因子：
1.7
作者：
Eisthen, HL
通讯作者：
Eisthen, HL
DOI：
10.1073/pnas.0508430102
发表时间：
2005-11-29
影响因子：
11.1
作者：
Farris, SM;Roberts, NS
通讯作者：
Roberts, NS
DOI：
10.1590/s0101-81752003000100006
发表时间：
2003-03-01
期刊：
Revista Brasileira de Zoologia
影响因子：
--
作者：
Almeida, Waltécio de Oliveira;Christoffersen, Martin Lindsey;Silva, Gustavo Sene
通讯作者：
Silva, Gustavo Sene