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Fig. 4. Multiple-unit activity in trigeminal sensory neurons innervating the cement
gland is increased by attaching a weight to the mucus strand. (A) Diagram of
the head end of the inverted tadpole preparation. The weight attached to the
cement gland mucus simulates attachment. Multi-unit activity is recorded by a
suction electrode on the trigeminal ganglion. (B) Examples of a 30 s duration
multi-unit recording showing spontaneous spike activity in the unattached
state and increased activity when the weight is attached. (C) Combined results
from 7 animals showing a sustained increase in trigeminal activity over a 60
min period of weight attachment and a return to control levels after the
weight is removed. Activity is measured as the number of spikes in each 30 s
period and is normalised relative to that at 25 min for each recording. Values
are means + S.D.
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