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By P. D. Evans

Insect body structure is presently present process a revolution with the elevated program of molecular organic suggestions to enquire the molecular mechanisms underlying the physiological responses to insect cells. Advances in Insect body structure has instituted a dedication to the booklet of top of the range studies on molecular biology and molecular genetics in components the place they supply an elevated knowing of physiological strategies in bugs. quantity 24 is the 1st to incorporate such in particular sought articles.

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The DUM cells are characterized by a dorsal soma position; this soma is unpaired and gives off a single neurite which splits off to both sides, where a scarce dendritic field is elaborated. Such a group of up to nine neurones has been seen in all thoracic ganglia. They exit the ganglion where the axons split in up to four branches. In the 4th abdominal ganglion a single neuron was detected (Plotnikova, 1969). , 1971; Hoyle, 1978; Hoyle and Dagan, 1978; Heitler and Goodman, 1978; for recent studies concerning the effects of DUM cells on a flight muscle, see Whim and Evans, 1988, 1991).

28 W. KUTSCH AND 0. BREIDBACH reduction of the flight system and, ultimately, to unwinged species (for summary, see Kutsch and Kittmann, 1991). Correlated with the reduction of the wing system there is also a reduction of the major flight muscles. Even though, the appropriate MNs (number, position, dendritic organization) are very similar (Fig. 2). There are only minor differences pointing to some positive correlation between flight ability, soma size and extension of the dendritic projection (Kittmann and Kutsch, unpublished).

Increase in number of scolopidia, change in the structure of the membrana tectoria). HOMOLOGOUS STRUCTURES IN THE NERVOUS SYSTEMS OF ARTHROPODA 31 For a review on the peripheral nervous system, especially with respect to the foreleg containing the auditory organ of Tettigoniida, see Lakes and Schikorski (1990). In a detailed study (Lakes-Harlan and Mucke, 1989), the receptor fields and the nerve branches of a tettigoniid auditory organ have been described for several individuals within one species (Ephippigger ephippigger, Tettigoniida).

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