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Fig. 7. Effects of external disturbances on activity of motor neurones innervating
the accessory flexor muscle. (A) During the quiescent state, three slow units
having different amplitudes (coloured in the magnified inset) were clearly
discriminated. Only the small CI unit (1) fires tonically at about 3 Hz. (B)
Tapping the recording substrate evoked brief activation of the large CI unit
(2) additionally to the small CI unit (1) and slow excitatory units
(especially in the smallest units). (C) Touching the prothoracic tarsus
ipsilateral to the recording site evoked longer activation of two CI units and
slow units. (D) Strong pinching of the same tarsus evoked a brief activation
of intermediate units and subsequent long-lasting activation in two CIs and
slow units. In this example, the tonic activation of CIs and slow units was
sustained more than 70 s with slowly adapting discharges.
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