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Morphological organization of the posterior midgut (PMG1 and PMG2). (A) Cross-section of PMG1. (B,C): rough endoplasmic reticulum (rer), microvilli (mv), and electron-dense vesicles (arrowheads in B, v in C) in the apical part of columnar cells in PMG1. (D) Microvilli (mv) of the epithelial cells in PMG2. e: epithelium; l: lumen; pm: peritrophic matrix. Bars: 100 μm (A), 5 μm (B), 500 nm (C), 1 μm (D).
