| 龙玲利,卢明明,竺俊全.2014.可口革囊星虫肾管纤毛的分布及结构特征.动物学杂志,49(2):253-260. |
| 可口革囊星虫肾管纤毛的分布及结构特征 |
| Distribution and Structural Features of Nephridial Cilia in the Sipunculan Phascolosoma esculenta |
| 投稿时间：2013-06-01 修订日期：2014-03-05 |
| DOI： |
| 中文关键词: 可口革囊星虫 肾管 纤毛 结构特征 功能 |
| 英文关键词:Phascolosoma esculenta Nephridium Cilia Structural feature Function |
| 基金项目:浙江省重大科技专项重点农业项目(No. 2011C12013) |
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| 中文摘要: |
| 为了解可口革囊星虫(Phascolosoma esculenta)肾管纤毛的结构特点及其功能, 采用显微及亚显微技术观察研究了可口革囊星虫肾管纤毛的分布位置及形态结构特征。结果表明, 肾管外膜多纤毛细胞表面簇生纤毛、内部柱状上皮细胞与立方上皮细胞游离面着生分散的纤毛, 肾口内面也着生纤毛。纤毛结构由纤毛干、过渡区、基体及其纤毛小根组成; 纤毛干由“9+2”结构的轴丝外被纤毛膜构成; 纤毛干与基体之间为过渡区, 中央微管终止于此, 外周双联微管通过过渡区和基体的外周轴丝相连; 基体呈圆筒状, 为“9 0”结构; 纤毛小根分长根和短根, 均为基体发出的由微细原纤维组成的圆锥形结构, 具间隔70nm的明显横纹。肾管纤毛可能在促进体腔液流动、提高肾管对体腔液的过滤作用以及引导成熟精卵进入肾管等方面发挥作用。 |
| 英文摘要: |
| To understand the structural characteristics and functions of cilia in the nephridium of Phascolosoma esculenta, the distribution and morphological structure of cilia were investigated by light and electron microscopy. Cilia are widely present in the nephridium, including the inner face of the nephrostome. Furthermore, the surface of multiciliary cells on the adventitia bears tufts of cilia while the free surface of columnar and cuboidal epithelial cells is sparsely ciliated. Structurally, a cilium can be divided into a ciliary shaft, transitional zone, basal body and ciliary rootlets. Ciliary shaft is composed of a canonical “9+2” microtubule structure and the coated membrane. The peripheral doublet microtubules are continuous with the axoneme of basal body by transitional zone. The area between ciliary shaft and basal body is the transitional zone, where the central microtubules terminate. The cilia are anchored by the ciliary rootlets projecting from the cylindrical basal body, which shows a “9 0” arrangement of microtubules. Cross striations within the conical rootlets have a 70nm periodicity. Rootlets, made up of microfibrils, contain a long rootlet and two short rootlets. It can be probably concluded that cilia in the nephridium are mainly responsible for promoting the flow of the coelomic fluid, improving the function of filtration and directing mature spermatozoa and eggs into the nephridium. |
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