Innervation of the lateral line system in the blind cavefish Astyanax mexicanus (Characidae) and comparisons with the eyed surface-dwelling form
Innervation of the lateral line system in the blind cavefish Astyanax mexicanus (Characidae) and comparisons with the eyed surface-dwelling form
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DOI：
10.1007/s10228-015-0458-7
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发表时间：
2015-11-01
影响因子：
1.2
通讯作者：
Sasaki, Kunio
中科院分区：
文献类型：
--
作者：
Sumi, Keina;Asaoka, Ryu;Sasaki, Kunio
本文研究了盲穴鱼Astyanax mexicanus的侧线系统及其神经支配，并与同种有眼的体表型进行了比较。在这两种形式中，浅表神经瘤几乎出现在身体和尾鳍的整个表面上，盲型的数量在头部（831）和尾部（511）上比有眼型（分别为531和251）要多，但在躯干上的数量要少（1，305 vs. 2，125）。在盲型中，颊部和下颌部的浅表神经瘤大量增生，下颌支广泛分叉，包括一个额外的主枝，这在有眼型中是不存在的。在这两种形式中，躯干上的浅表神经瘤由来自外侧支的一些背侧和腹侧枝（大致对应于侧线鳞片的数量）支配。在这两种形式中，眶下和躯干侧线管中的管神经瘤由神经支配，而无支配浅表神经瘤的相关元件。因此，侧线鳞片每个只容纳一个单一的管神经肥大。这种侧线鳞片的情况在鲤科中被认为是常见的，与鲤科的情况形成鲜明对比（两者都包括在耳泡目中），其中侧线鳞片每个都有一排垂直的表面神经乳突。
The lateral line system and its innervation were examined in the blind cavefish Astyanax mexicanus (Characidae) and compared with that in the eyed surface-dwelling form of the same species. In both forms, superficial neuromasts occurred on almost the entire surface of the body and caudal fin, the number in the blind form being greater on the head (831) and tail (511) than in the eyed form (531 and 251, respectively), but lower on the trunk (1,305 vs. 2,125). In the blind form, superficial neuromasts were greatly proliferated on the cheek and lower jaw, the mandibular ramus being extensively ramified, including an additional major ramule that was absent in the eyed form. In both forms, superficial neuromasts on the trunk were innervated by a number of dorsal and ventral ramules (roughly corresponding to the number of lateral line scales) derived from the lateral ramus. In both forms, canal neuromasts in the infraorbital and trunk lateral line canals were innervated by nerves without associated elements innervating superficial neuromasts. Accordingly, the lateral line scales each accommodated only a single canal neuromast. This lateral line scale condition was recognized as common in Characidae, being in sharp contrast to the condition in Cyprinidae (both included in Otophysa) in which the lateral line scales each had a vertical row of superficial neuromasts.