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- W2097375504 abstract "The morphogenesis of epicorneal structures in nocturnal Lepidoptera was studied with light and electron microscopy. During the first 4-5 days after pupation, microvilli (with their tips hexagonally distributed) arose gradually from the corneagenous cell surface. At the time of onset of moulting (about 5 days after pupation), patches of lamellar elements appeared distal to the tips of the microvilli. There was one patch for each microvillus from which the patch was separated by a narrow cleft. The cleft was traversed by a few thin bridges which seemed to originate in the microvillus. The bridges were interpreted to be extracellular continuations of intramicrovillar filaments and to insert on the proximal surface of the patch. At about 5 1/2 days after pupation, the patches were seen to be composed of two outer electron-dense lines and a less distinct, inner and thicker dense line. The patches bulged markedly, their concavity turned towards the microvillar tip. A number of discrete bridges extended between the microvillus and the base of the patch, which now appeared as a low dome. The bases of the domer later coalesced to form a continuous lamellar 'membrane' system ( epicorneal lamina , ECL), and the concavity of the domes increased, forming successively deeper lamina evagmations (LE) which strictly retained their spatial relationship to the tips of the microvilli (MV) throughout the ontogenesis. Growth of the ECL evaginations to form an array of successively higher cupoles—and, finally, the complete nipple anlage-was suggested to take place by addition of new material at all points of the LE surface within the palisade of MV/LE bridges. The latter were proposed to act as structures of constraint preventing the ECL to buckle randomly and causing the evaginations to develop in a regular fashion. The results were compared with those described in reports on the morphogenesis of the body cuticle of insects. It was proposed that different types of corneal surface protuberances (corneal nipples of various heights; low protrusions in regular or irregular arrangement) as well as some types of surface lpturing in the body cuticle of insects may be produced on the basis of the same mechanism as the one described for the formation of the full-sized nipples of nocturnal Lepidoptera" @default.
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- W2097375504 date "1971-08-20" @default.
- W2097375504 modified "2023-10-01" @default.
- W2097375504 title "Ontogenesis of corneal surface ultrastructure in nocturnal Lepidoptera" @default.
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- W2097375504 doi "https://doi.org/10.1098/rstb.1971.0100" @default.
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