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Fig. 7. Effects of abdominal posture on descending interneurons other than
interneuron C1. (Ai) Two statocyst-driven descending units in the
circumesophageal commissure. The original recording is shown at the top (CC),
and two unit activities (A and B) discriminated from the record are shown in
the second and third traces. The bottom trace monitors body tilt angle. Unit A
responded directionally to ipsilateral-side-down tilting (ISD) whereas unit B
responded to contralateral-side-down tilting (CSD). (ii) Superimposition of
interneuron spikes from the two isolated units. For clarity, the superimposed
records are enlarged in both the time and voltage scale. The former scale is
provided in the figure while the latter factor was 5.0 relative to the raw
data for both units. (B) Spike activities during walking in different
orientation angles with the abdomen extended (open bars) and flexed (filled
bars). Unit A (i) showed no directional responses when the animal extended or
flexed its abdomen whereas unit B (ii) could represent directional information
when the animal extended its abdomen. Unit B showed no directional responses
during abdominal flexion.
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