Figure 6.

Detailed illustrations of the histology and ultrastructure of the accessory glands. As ultrastructural differences between the three externally determined regions only concern the thickness of the basal lamina and the cuticular intima, main attention is focused on the secretory-active cells of Region III. Each cell (A) may be subdivided into a basal part (C, E) containing the nucleus as well as an apical part (B) with all compartments necessary for the production of the lipophilic secretion. The cuticular intima consists of three layers, i. e. an osmiophilic outer layer, a dense middle layer, and a loosely structured inner layer (D). Abbreviations: see Figure 1 legend. Bars: 10 µm.