Cranial and spinal nerve organization in amphioxus and lampreys: evidence for an ancestral craniate pattern.
Cranial and spinal nerve organization in amphioxus and lampreys: evidence for an ancestral craniate pattern.
复制标题
文昌鱼和七鳃鳗的颅神经和脊神经组织：祖先颅骨模式的证据。
DOI：
10.1159/000147529
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Northcutt,RG
中科院分区：
文献类型：
--
作者：
Fritzsch,B;Northcutt,RG
文昌鱼的脊神经与七鳃鳗的脊神经和颅神经进行了比较。文昌鱼的脊神经背根与七鳃鳗的许多脑神经的感觉和运动混合背根相似，但与七鳃鳗和有颌鱼类的纯感觉脊神经背根不同。同样，七鳃鳗的颅神经V、VII、IX和X，以及文昌鱼的所有脊神经，都缺乏单独的腹侧运动根，而腹侧运动根是七鳃鳗和其他脊椎动物所有脊髓运动根的恒定特征。基于这些相似性和差异，有人提出，颅神经和脊神经在颅是独立衍生的系列同系物的元素文昌鱼一样的祖先模式。进一步的进化包括在大多数颅神经和所有脊神经中增加神经嵴衍生的神经节，以及在许多颅神经中增加基板衍生的神经节。眼运动神经的可能的同源性进行了讨论，但不能解决由于这些神经的情况下，盲鳗，这是唯一相关的外群。
The spinal nerves in amphioxus are compared with the spinal and cranial nerves in lampreys. The dorsal spinal roots in amphioxus are similar to the mixed sensory and motor dorsal roots of many cranial nerves in lampreys but not to the purely sensory dorsal spinal roots in lampreys and gnathostomes. Likewise, cranial nerves V, VII, IX and X in lampreys, and all spinal nerves in amphioxus, lack a separate ventral motor root which is a constant feature of all spinal motor roots in lampreys and other vertebrates. Based on these similarities and differences, it is proposed that cranial and spinal nerves in craniates are independently derived serial homologs of elements of an amphioxus-like ancestral pattern. Further evolution involved the addition of neural crest-derived ganglia to most cranial and all spinal nerves, and the addition of placodally derived ganglia to many cranial nerves. The possible homology of ocular motor nerves is discussed but cannot be resolved owing to the absence of these nerves in hagfishes, which are the only relevant outgroup.