The abdomen is used by acridid grasshoppers for steering during flight (Camhi, 1970a ; Gewecke & Philippen, 1978; Taylor, 1981 ; Altman, 1982; Arbas, 1986; for a review see Rowell, Reichert & Bacon, 1985). The aim of the present study is to characterize some of the various motor neurones innervating the dorsal and ventral longitudinal muscles of the previously undescribed second abdominal segment (ASG2) of Locusta and to describe their activity during steering.

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