The fine structure of the cilia from ctenophore swimming-plates.
The fine structure of the cilia from ctenophore swimming-plates.
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DOI：
10.1083/jcb.9.2.383
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发表时间：
1961-02
期刊：
影响因子：
--
通讯作者：
AFZELIUS, B A
中科院分区：
文献类型：
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作者：
AFZELIUS, B A
用电子显微镜对鞭毛虫游泳板进行了观察。它被认为是紧密的六角形排列中的长纤毛的组合。六角形填充物的一个方向平行于游泳板的长边，并垂直于纤毛跳动的方向。游泳板上的所有纤毛都是同一方向的。游泳板运动中的有效拍动指向动物的流产极，这也是所有纤毛中不成对的外周细丝的一侧。纤毛节拍的方向与纤毛细丝的位置是固定的。游泳板纤毛不同于其他类型的纤毛和鞭毛，其纤毛排列可以描述为9+3，而不是传统的9+2模式。中央细丝出现在一组两个“管状”细丝和一个相关的紧密细丝中。紧凑的细丝可能具有支撑功能。它被称为“中丝”。周围9根纤毛中的2根(图1，3号和8号)通过纤毛层与纤毛膜相连，纤毛层将纤毛分成两个不相等的隔室。这些薄片被称为“分隔薄片”。对隔板排列的一些观察表明，它们的功能是通过将纤毛粘合在一起形成横向排列。两排纤毛相交的距离很短，只有30A的间隙。交汇点靠近分隔山脊的终点处。有时可以看到一种电子密度高的物质弥合了这一缺口。注意到隔板的排列有一些不规则性，特别是在纤毛的外围排上。在这些列的许多纤毛中，纤毛膜下有小囊泡。
The ctenophore swimming-plate has been examined with the electron microscope. It has been recognized as an association of long cilia in tight hexagonal packing. One of the directions of the hexagonal packing is parallel to the long edge of the swimming-plate and is perpendicular to the direction of the ciliary beat. All the cilia in the swimming-plate are identically oriented. The effective beat in the movement of the swimming-plate is directed towards the aboral pole of the animal, and this is also the side of the unpaired peripheral filament in all the cilia. The direction of the ciliary beat is fixed in relation to the position of the filaments of the cilia. The swimming-plate cilium differs from other types of cilia and flagella in having a filament arrangement that can be described as 9 + 3 as opposed to the conventional 9 + 2 pattern. The central filaments appear in a group of two "tubular" filaments and an associated compact filament. The compact filament might have a supporting function. It has been called "midfilament." Two of the peripheral nine filaments (Fig. 1, Nos. 3 and 8) are joined to the ciliary membrane by means of slender lamellae, which divide the cilium into two unequal compartments. These lamellae have been called "compartmenting lamellae." Some observations of the arrangement of the compartmenting lamelae indicate that they function by cementing the cilia together in lateral rows. The cilia of the rows meet at a short distance from each other, leaving a gap of 30 A only. The meeting points are close to the termini of the compartmenting ridges. An electron-dense substance is sometimes seen bridging the gap. Some irregularities are noted with regard to the arrangement of the compartmenting lamellae particularly at the peripheral rows of cilia. In many cilia in these rows there are small vesicles beneath the ciliary membrane.