Roth Anton
Department Biologie II der LMU, Luisenstrasse 14, 80333, München, Germany.
Naturwissenschaften. 2003 Jun;90(6):251-5. doi: 10.1007/s00114-003-0424-5. Epub 2003 May 21.
In amphibians the lateral line sense organs, i.e., mechanoreceptors (neuromasts) and electroreceptors, develop autonomously from placodal tissue, with no need for innervating nerve fibers. The present study deals with the question whether or not the mechano- and the (ampullary) electroreceptors develop in the same manner in teleosts. On the tail of larval catfish, Silurus, the first mechano- and electroreceptors appear several days after hatching in two longitudinal rows, one along the outgrowing main branch of the lateral line nerve and one along its ventral branch. Prevention of outgrowth of both nerve branches by repeated nerve sectioning, before the receptors form, shows (1) that the mechanoreceptors can develop without innervation as in amphibians, and (2) that the electroreceptors do not develop without innervation, unlike amphibian electroreceptors. These results are discussed with regard to the placodal origin and the phylogeny of the two sense organs.
在两栖动物中，侧线感觉器官，即机械感受器（神经丘）和电感受器，由基板组织自主发育而成，无需支配神经纤维。本研究探讨了硬骨鱼的机械感受器和（壶腹型）电感受器是否以相同方式发育的问题。在鲶鱼幼体的尾部，孵化几天后，第一批机械感受器和电感受器出现在两条纵列中，一条沿着侧线神经的主分支生长方向，另一条沿着其腹侧分支。在感受器形成之前，通过反复切断神经来阻止两条神经分支的生长，结果表明：（1）机械感受器可以像在两栖动物中一样在没有神经支配的情况下发育；（2）与两栖动物的电感受器不同，电感受器在没有神经支配的情况下不会发育。针对这两种感觉器官的基板起源和系统发育对这些结果进行了讨论。
