The respiratory central pattern generator of Lymnaea

We have recently described the respiratory behavior of a pulmonate mollusc, Lymnaea stagnalis, and identified relevant motor neurons and interneurons involved in this behavior. Three interneurons, namely right pedal dorsal 1 (R.Pe.D1), visceral dorsal 4 (V.D4) and Input 3 interneuron (Ip.3.I) comprise the central pattern generator (CPG). We demonstrate that appropriate connections exist between these interneurons and that they are sufficient to form the basis for the CPG.