Kemp A
Department of Anatomical Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia.
J Morphol. 1996 May;228(2):203-221. doi: 10.1002/(SICI)1097-4687(199605)228:2<203::AID-JMOR9>3.0.CO;2-5.
In common with the embryos of other anamniotes, young of the Australian lungfish, Neoceratodus forsteri, have ciliated cells in the epidermis. These first appear at stage 28, ˜ 10 days before hatching, and develop progressively to a peak in numbers and in activity at stage 44, just after hatching. After this point, ciliary action in the epidermal cells slowly declines, and cilia disappear completely from the outer surface of the hatchling by stage 52. Cilia are lost earlier from the oral epithelium, between stages 45 and 46, and from the epithelium covering the gills and lining the operculum at stage 51, although they are retained in the nares and in the cavity of the olfactory organ. To assess possible functions for the ciliated epidermis in lungfish hatchlings, the presence of cilia in the epidermis of young N. forsteri is compared with landmarks of development. The ciliated epidermal cells are not associated with movements of the embryo within the egg capsule, nor are they a part of a feeding mechanism. They are not related to oxygen uptake. The ciliated epidermis appears to function as a mechanism for clearing the animal of particles and settling organisms before hatching, when the egg membranes have developed holes, and after hatching, when the young fish is living among the submerged rootlets of trees growing on the river bank or in dense stands of aquatic plants. The function of a ciliated epidermis in N. forsteri hatchlings in relation to microhabitat is discussed. © 1996 Wiley-Liss, Inc.
与其他无羊膜动物的胚胎一样，澳大利亚肺鱼（Neoceratodus forsteri）的幼体在表皮中有纤毛细胞。这些细胞最早出现在第28阶段，即孵化前约10天，数量和活性逐渐增加，在孵化后的第44阶段达到峰值。此后，表皮细胞中的纤毛活动逐渐下降，到第52阶段时，幼体的外表面纤毛完全消失。口腔上皮的纤毛在第45至46阶段之间消失，鳃和鳃盖内衬上皮的纤毛在第51阶段消失，不过鼻孔和嗅觉器官腔内的纤毛仍保留。为了评估肺鱼幼体中纤毛表皮的可能功能，将澳大利亚肺鱼幼体表皮中纤毛的存在情况与发育标志进行了比较。有纤毛的表皮细胞与胚胎在卵囊内的运动无关，也不是摄食机制的一部分。它们与氧气摄取无关。纤毛表皮似乎起到一种机制的作用，在孵化前卵膜出现孔洞时以及孵化后幼鱼生活在河岸生长的树木的水下细根之间或密集的水生植物丛中时，清除动物身上的颗粒和附着生物。本文讨论了澳大利亚肺鱼幼体中纤毛表皮与微生境相关的功能。© 1996威利 - 利斯公司。
