Phylogeny of nucleus medianus of the posterior tubercle in ray-finned fishes

作     者：R.Glenn NORTHCUTT 

作者机构：Laboratory of Comparative NeurobiologyScripps Institution of Oceanographyand Department of NeurosciencesUniversity of CaliforniaLa JollaUSA 

出 版 物：《Integrative Zoology》 (整合动物学（英文版）)

年 卷 期：2009年第4卷第1期

页      面：134-152页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0905[农学-畜牧学] 0906[农学-兽医学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：supported in part by the National Science Foundation(IBN-0236018) 

主　　题：bichirs evolution gars nucleus medianus posterior tubercle sturgeons. 

摘      要：The brains of ray-finned fishes form a morphocline of increasing complexity,from cladistians through *** is particularly apparent in the posterior tubercle of the *** cladistians,the posterior tubercle consists of a periventricular nucleus and a migrated nucleus medianus that is fused across the *** more advanced ray-finned fishes,such as gars and bowfins,the posterior tubercle comprises numerous additional mi-grated nuclei,termed the preglomerular complex,in addition to a more well developed nucleus *** teleosts,the most derived ray-finned fishes,there is an even more elaborate preglomerular complex,but there is no recognizable nucleus *** an attempt to explain the variation in the posterior tubercle of the diencephalon in ray-finned fishes,the immunohistochemistry and connections of nucleus medianus were examined in cladistians,gars and *** each of these taxa,nucleus medianus exhibits large numbers of calretinin-positive neurons and has ascending projections that terminate in several divisions of the *** teleosts,such as goldfish,also exhibit numerous cell groups in the posterior tubercle that are rich in calretinin,none of these cell groups has connections that are comparable to those of nucleus medianus in non-teleost ray-finned *** is possible,therefore,that nucleus medianus was lost with the origin of teleosts.