Fig. 9.

Superfusion of 10⁻⁶ mol l⁻¹ pevpyrokinin-1 over the STNS of the lobster did not alter the pyloric motor pattern. (A) Control recordings show the typical triphasic pyloric pattern, with bursts in the pyloric dilator (PD) neurons (pdn), followed by bursts in the lateral pyloric (LP) and pyloric (PY) motor neurons (vlvn). Pyloric-timed bursts in the ventricular dilator (VD) neuron (mvn) are largely in phase with the PY neuron bursts. A single burst in the lateral gastric (LG) motor neuron is also visible on the mvn recording. (B) When PevPK1 was superfused across the stomatogastric system, no changes in the firing of any of the pyloric neurons was evident, although the duration of the single burst seen here in the lateral gastric motor neuron increased.