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Figure 2


Fig. 2. AGR responds to tension increase in gm1 muscles. (A) Extracellular recording of AGR on dgn during passive stretch of a gm1 muscle. Stretch was applied by moving the ossicle between the gm1 and gm4 muscles in the posterior direction. AGR firing frequency increased during the stretch (top trace). (B) Extracellular recording of AGR on agn during isometric contraction of a gm1 muscle. Anterior and posterior muscle attachment sites were fixed to the Sylgard® such that the muscle attained its resting length (measured beforehand in the intact animal). During spontaneous gastric mill rhythms, activity of the GM motor neurons (bottom trace) activated AGR. Before GM activity, the AGR spike initiation zone in the stn was active. During GM activity, the spike initiation zone close to the muscle became active (*). The top trace shows AGR firing frequency in this condition. See text for definition of abbreviations.





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