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Figure 2


Fig. 2. The gastric mill rhythm is triggered by poc nerve stimulation. (Left) Prior to poc stimulation, there was an ongoing pyloric rhythm [medial ventricular nerve (mvn) and pdn], but no gastric mill rhythm (dgn, lgn). The large, tonically active unit in the dgn corresponds to the activity of the anterior gastric receptor (AGR) neuron. AGR is a muscle tendon proprioceptor neuron that is spontaneously active in the isolated STNS (Combes et al., 1995; Smarandache and Stein, 2007). (Middle) 2 min after tonic poc stimulation (15 Hz, 30 s), the gastric mill rhythm was triggered, as is evident from the rhythmic bursting in the protractor LG neuron that alternated with the retractor phase activity of the DG, VD and IC neurons. Note the pyloric-timed bursting in the LG neuron. (Right) This expanded section of the middle panel shows more explicitly that each protractor LG burst is time-locked to the pyloric rhythm. Each period of inactivity in LG starts with a pyloric dilator (PD) neuron burst (grey bars). Pro., protraction, Ret., retraction.





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