Figure 8: Magnified micrographs from Figures 3 and 5 show that the secretory pores are lined with cork-screw shaped channel system. Figure 8 shows small imbricated papilla (Im) and the epithelial cells that line channel system have very smooth microvilli (Mv). Note also the presence of secretory pouches (Spo), which can be seen along the channel system. ×1500.