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Fig. 1. Schematic diagram of the stomatogastric nervous system, illustrating the
different experimental setups. Anterior is toward the top. The stomatogastric
nervous system contains four ganglia, including the paired commissural ganglia
(CoG), the oesophageal ganglion (OG) and the stomatogastric ganglion (STG),
plus their connecting and peripheral nerves. The STG contains the motor neuron
LG, which is part of the central pattern generator of the gastric mill rhythm.
LG projects its axon through the dorsal ventricular nerve (dvn) to
the lateral ventricular nerve (lvn) and the lateral gastric nerve
(lgn). It is the only neuron that innervates the gm6 muscle.
Experimental setups: (1) In some experiments, the inferior (ions) and
superior (sons) oesophageal nerves were transected to eliminate
descending modulatory input to the STG (example shown on top right). In these
experiments, the ion was stimulated extracellulary to elicit a
gastric mill rhythm (Bartos and Nusbaum,
1997; Stein et al.,
2005). (2) With both CoGs intact, gastric mill rhythms were
elicited by stimulation of one of the dorsal posterior oesophageal nerves
(dpon; Beenhakker et al.,
2004; Stein et al.,
2005; example shown on top left). (3) When the electrical response
of the gm6 muscle (shown for the right muscle in the diagram) or gm6 muscle
force (shown for the left muscle) was recorded, the lvn was
transected between stimulation compartment and STG (broken lines on
lvn). The stump of the lvn was then stimulated
extracellularly with various stimulus protocols to elicit action potentials in
the LG axon.
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