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A Hypothetical Pattern Generator consisting of two pacemaker cells (1
and 2) that excite flexor and extensor motoneuron pools, respectively. The
pacemaker cells discharge with a spontaneous rhythm and are coupled by
inhibitory interneurons (black) that ensure that their discharge is out of phase.
When pacemaker 1 fires, the flexor motoneuron is activated and pacemaker 2 is
suppressed. When pacemaker 1 falls silent pacemaker 2 can fire, maintaining the
silence of pacemaker 1 and activating the extensor motoneuron. The upper two
traces represent intracellular records from pacemakers 1 and 2; the lower traces
represent extracellular recordings from flexor (F) and extensor (E) motoneurons.
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