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  • Pioneer fibres  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Integument and sensory nerve differentiation ofDrosophila leg and wing imaginal discs in vitro (1978)
    Springer
    Development genes and evolution 185 (1978), S. 59-77 
    Details
    ISSN: 1432-041X
    Keywords: Nerve differentiation ; Pioneer fibres ; Imaginal discs ; β-ecdysone-Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An ultrastructural analysis is presented of the cuticular and neural structures formed by the prothoracic leg and wing imaginal discs of maleDrosophila melanogaster larvae during culture in vitro with 0.2 μg/ml of β-ecdysone. A pupal cuticle, and subsequently an imaginal cuticle with a well-defined epicuticle and a laminated endocuticle is formed. The ultrastructure of the epidermis and of cuticular structures such as bristles, trichomes, apodemes, and tracheoles is very similar to that found in situ. Dendrites and nerve cell bodies are formed in vitro, and sensory axons form nerve bundles similar to those of normal appendages in situ, despite their isolation from the central nervous system. It is concluded that at the ultrastructural level, differentiation in vitro closely parallels the normal course of development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848215
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  • 2
    Electronic Resource
    Electronic Resource
    Embryonic development of an insect sensory system, the abdominal cerci ofAcheta domesticus (1979)
    Springer
    Development genes and evolution 186 (1979), S. 151-178 
    Details
    ISSN: 1432-041X
    Keywords: Abdominal cerci ; Pioneer fibres ; Acheta domesticus ; Sensory neurogenesis ; Sensillar neurons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. The embryonic development of the abdominal cerci of the house cricketAcheta domesticus is described from scanning and transmission electron microscope data. 2. A staged description of externally visible events in embryogenesis is tabulated as a context for describing the chronology of embryonic development of the abdominal cerci. 3. Three phases of cercal development are distinguished: differentiation of the cercal anlagen and secretion of the first embryonic cuticle; elongation of the cercus culminating in the secretion of the second embryonic cuticle after completion of a continuous epidermis at the time of dorsal closure; and differentiation of functional sensilla on the third embryonic (first instar) cuticle. 4. The first axon profiles appear in the cercus immediately before elongation of the cercus. These axons have dendrites with ciliary configuration in the lumen of the cercus. Glial cells associated with the pioneer axons may precede the axons in occupying dorsal and ventral luminal midlines of the cerci. 5. Trichoid sensilla appear in the integumet following apolysis of the second embryonic cuticle. 6. Axons are added to the dorsal and ventral pioneer fibre bundles shortly before sensilla become apparent. 7. The majority of sensory axons traverse the cercus during the final 15% of embryonic development. 8. The sensilla of the first instar cercus do not achieve their final orientation until the cercal cuticle is expanded following eclosion from the second embryonic cuticle that encloses the hatchling until it reaches a free surface. 9. The role of the pioneer fibres in establishing a pathway for the functional sensillar neurons is discussed in relation to other studies of sensillar development in insects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848176
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    Paper (German National Licenses)
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