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在Lampreys和Gnathostomes中比较三神经分支,揭示了脊椎动物口腔神经内的进化变化

Yuki Nakanishi¹, Motoki Tamura², Fumiaki Sugahara³

¹Graduate School of Science and Engineering, Ehime University, Matsuyama, Japan.

The Journal of comparative neurology

|March 16, 2026

概括

三角神经随着下巴的获得而显著演变. 兰普雷rV2/3B是运动型,rV2/3A是混合型,对比的是状脊椎动物,并表明神经组织的结构变化.

科学领域:

神经科学是一个神经科学.
进化生物学进化生物学
比较解剖学的比较解剖学

背景情况:

脊椎动物的三神经 (r) 有三个分支:眼部 (rV1),大部 (rV2) 和下部 (rV3).
像鱼这样的无脊椎动物具有保存的三分支配置 (rV1,rV2/3A,rV2/3B),但rV2和rV3的同质性不清楚.
了解鱼三神经组织,可以了解脊椎动物的进化.

研究的目的:

通过比较鱼和的脊椎动物胚胎来研究三神经的进化修饰.
为了澄清三神经分支 (rV2/3A,rV2/3B) 的同质性和功能.
追踪三神经感官核和体型的演变.

主要方法:

兰普雷rV2/3B和rV2/3A的神经追踪详细分析.
对各种脊椎动物大脑内的感官投影进行比较分析.
使用Drg11进行基因表达分析,这是主要感官核 (PrV) 和脊柱三胞胎核 (SpV) 的标记物.

主要成果:

兰普雷rV2/3B只能刺激皮膜,并且只含有机动纤维.
兰普雷rV2/3A含有感觉和运动纤维,与有下巴的脊椎动物形成鲜明对比,rV2纯粹是感觉的,rV3是混合的.
生虫的主要感觉核 (PrV) 缺乏体内组织,这表明它在生虫中的进化.
一个相当于PrV的区域在鱼中不存在,这表明与下巴进化相关的显著结构变化.

结论:

三角神经在部获得过程中经历了实质性的结构修改.
这些修改包括改变了内化区域,损失了皮膜内化分支,以及新的脑细胞核的发展.
对比分析揭示了三角神经组织和中央处理中的关键进化事件.

关键词:

RRID:AB_47758585 在线播放一个的子.发展发展发展发展发展.进化演化演化演化演化演化演化演化兰普雷 (Lampprey) 是一个灯具.三神经的主要感觉核.三角神经是三角神经的一部分.

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