Ultrastructure of junctions between cuticle and apical plasma membrane. A Junctions between cuticle and apical plasma membrane in the anterior chamber visible as electron dense structures (arrows), from which fibers (arrowheads) extend into the procuticle B Junctions between cuticle and apical plasma membrane in the papillate region (arrowheads) associated with abundant bundles of microtubules inside the cell (arrow) C, D Higher resolution images of bundles of microtubules (MTB) associated with junctions between cuticle and apical plasma membrane. Image D displays the area denoted on image C (red rectangle) where individual microtubules (arrows) can be discerned.