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Fig. 5. In preparations in which the stn was intact, the muscarinic
acetylcholine agonist oxotremorine enhanced ongoing pyloric activity. (A)
Recordings of pyloric activity in a representative preparation in control
saline, during superfusion of 10–6 mol l–1
oxotremorine, and during the wash with normal saline. Oxotremorine enhanced
the overall pyloric pattern, seen most clearly here as an increase in pyloric
cycle frequency and as increased activity in the PD (pdn and
lvn) and VD (mvn) neurons. (B) Phase diagram, showing two
cycles of the activity of the pyloric pattern in control saline. (C) Phase
diagram of the pyloric pattern when the STG was superfused with
10–6 mol l–1 oxotremorine. (D) Plot of the
cycle period in both control saline and oxotremorine, showing the decreased
cycle period during oxotremorine application. (E,F) Graphs of spike frequency
during bursts and burst duration, respectively, in each of the pyloric
neuronal types in control saline and when the STG was being superfused with
oxotremorine. N=5 for all graphs. Bars indicate standard deviations.
Asterisks indicate a value significantly different from control
(P<0.05). Nerves: mvn, medial ventricular nerve
(recording action potentials of the VD and IC neurons); pdn, pyloric
dilator nerve (recording action potentials of the PD neurons); lvn,
lateral ventricular nerve (recording action potentials of the PD, LP and PY
neurons).
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