The body and appendages of crayfish are covered with mechanoreceptive sensory hairs which are highly sensitive to slight water movements (e.g. Wiese, 1976; Tautz & Sandeman, 1980). The central processing of this sensory input has been studied primarily in the abdominal ganglia and especially in the last (sixth) ganglion which innervates the tailfan of the crayfish (Wine, 1984). Plummer, Tautz & Wine (1986) describe the frequency selectivity of three types of mechanosensory interneurones in the sixth ganglion. The work presented here was undertaken to find out if these classes are represented in other abdominal ganglia as well.

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