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首页> 外文期刊>Russian journal of marine biology >The Structure of the Proboscis Musculature in Baseodiscus delineatus (Delle Chiaje, 1825) (Heteronemertea) and the Comparative Analysis of the Proboscis Musculature in Heteronemerteans
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The Structure of the Proboscis Musculature in Baseodiscus delineatus (Delle Chiaje, 1825) (Heteronemertea) and the Comparative Analysis of the Proboscis Musculature in Heteronemerteans

机译：狄氏吻中的长鼻肌肉的结构（Delle Chiaje，1825年）（Heteronemertea）和异足动物的长鼻肌肉的比较分析

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摘要

The proboscis musculature was studied in the nemertean Baseodiscus delineatus using confocal laser scanning and electron transmission microscopy. Three muscle layers were differentiated in the proboscis wall: the outer-longitudinal, the diagonal, and the inner-circular layer. The endothelium consists of two cell types: apical supportive cells with rudimentary cilia and subapical myocytes making up the inner-circular musculature of the proboscis. The supportive cells have thin processes attached to the basal extracellular matrix and their perikarya are spread over the apical surfaces of myocytes. The endothelium of B. delineatus is characterized by a folded basal layer of the extracellular matrix and by different heights of myocyte processes, giving an impression that the inner-circular musculature is multilayered. Comparative analysis shows that the diagonal musculature of Baseodiscus is not homologous to that of other heteronemerteans. An assumption is made that the inner-circular muscles have endothelial origin in all heteronemerteans.
机译：使用共聚焦激光扫描和电子透射显微镜在nemertean Baseodiscus delineatus中研究了长鼻肌肉。在长鼻壁上分为三个肌肉层：纵向外层，对角线层和内圆层。内皮由两种细胞类型组成：具有纤毛纤毛的根尖支持细胞和组成长鼻内圆肌组织的根尖下肌细胞。支持细胞具有附着于基底细胞外基质的稀疏过程，其周核细胞分布在心肌细胞的顶表面。界线虫的内皮的特征在于细胞外基质的折叠基底层和不同高度的心肌细胞过程，给人的印象是内圆肌肉组织是多层的。对比分析表明，Baseodiscus的对角肌组织与其他异形动物不相似。假定所有异种内膜中的内圆肌均具有内皮起源。

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