The trunk nervous system with the sensory cilia and ventral nerve cord. A-D: The laser scanning microscopy views. A: Distribution of ventral patch type cilia with smaller cilia allayed along the ventro-lateral sides (arrowheads) with autofluorescence of the neuropodia. B: Notopodia and sensilla distributed at the tips. The axonal projections are seen from sensilla of the tips (ss), but such projections are not seen from patch type cilia (pt). C: Cellular distribution and neuropils of the ventral nerve cord. D: A cross-section of the ventral nerve cord to show the position of tubulinergic and serotonergic cells (arrowheads) within the cell body layers and axons in the neuropils. The two rectangles indicate the position of analysis for Figures E and F. The TEM images. E: Neuropil without obvious wrapping structure. The large axons are possibly motor neurons. F: The wrapped cell body of the ventral nerve cords. G: An enlarged view of glial membranes. ax, a relatively giant axonal bundle; ce, cell body layer; ss, sensilla type cell; pt, patch type cell; mt, mitochondrion; np, neuropil; nu, nucleus; npo, neruopodium. Scale bar in A-D: 50 μm; E, F: 2 μm; G: 0.1μm.