Fig. 3
Cellular organization of scape organ of Scutigera coleoptrata shown in a semi-schematic reconstruction based on TEM analysis. Three cone-shaped sensilla and two recto-canal epidermal glands associated with the scape organ are cut longitudinally. Examples of cell types constituting the scape organ are color-coded in a single cone-shaped sensillum (at center; receptor cells stained in red, beige, and olive-green; glial cells in yellow; sheath cells in various shades of blue) and one gland (to the right; cells stained in various shades of green). The helical bending of the dendritic outer segments found below the sensory cones has not been reproduced in this 2D-reconstruction to keep the drawing simple and comprehensible. ax, receptor cell axon; cc, canal cell; ca, cavity; co, sensory cone (of cone-shaped sensillum); ds, dendritic sheath; du, conducting canal; encu, endocuticle; epc, interstitial epidermal cell; epcu, epicuticle; esp, extracellular space; excu, exocuticle; gc, glial cell; gp, glandular pore; ic, intermediary cell; isl, inner sensillum lymph space; lod, long dendritic outer segments; osl, outer sensillum lymph space; ovs, secretion layer; rc1, receptor cell with long dendritic outer segments; rc2, receptor cell with short dendritic outer segments; rs, reservoir; sc, secretory cell; sod, short dendritic outer segments; sco, scolopale-like structure; shc1, first (proximal) sheath cell (scolopale cell); shc2, second (median) sheath cell; shc3, third (distal) sheath cell; spl, secretion plug; tb, tubular bodies; tde, terminal structures of long dendrites (including tubular bodies)