Rościszewska E, Ksiazkiewicz M
Cytobios. 1981;31(123-124):151-62.
The cells of the transporting epithelium of the tubus ventralis in Tetrodontophora bielanensis Waga (Collembola) are polarized, i.e. the major axis of the cell is determined by apical microvilli on one side and basal cell membrane infoldings on the other side. The involvement of this epithelium in fluid transport is indicated by the presence of PMC complexes, a large number of microtubules and glycogen in the middle and basal zones of the cells, and the arrangement of the endoplasmic reticulum, as well as by the presence of septate junctions and intercellular spaces. Typical features of this epithelium also include hemidesmosomes, and a well developed basement membrane to which they are attached. The cuticle covering the transporting epithelium is porous. It has a smooth surface, devoid of the wrinkles typical of other regions of the cuticle, which absorbs moisture and contributes to fluid transport.
贝氏异跳虫（弹尾目）腹管转运上皮细胞呈极化状态，即细胞的主轴由一侧的顶端微绒毛和另一侧的基底细胞膜内褶决定。该上皮细胞参与液体运输的证据包括：细胞中部和基部区域存在PMC复合体、大量微管和糖原，内质网的排列方式，以及存在分隔连接和细胞间隙。该上皮细胞的典型特征还包括半桥粒，以及与之相连的发育良好的基底膜。覆盖转运上皮的角质层是多孔的。其表面光滑，没有角质层其他区域特有的皱纹，能吸收水分并有助于液体运输。
