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Fig. 4. Motor neuronal activity recorded from the three motor nerve branches
(proximal-, middle- and distal-flexor nerves) supplying the main flexor muscle
before, during and after thanatosis. The maintenance phase of thanatosis is
shaded grey. During thanatosis, activity of intermediate- and fast-exciters
was almost completely suppressed (A–E). The intermediate exciters tended
to be activated more frequently when ventilatory movements (deflections, lower
trace) occurred frequently during thanatosis (B). However, their activity was
not necessarily coupled with ventilation phases but seen also in
non-ventilatory phases (arrows and time-stretched inset in B). In other
recordings, intermediate units vigorously activated with ventilatory movements
during the quiescent state (C) were rather suppressed when ventilatory
movements occurred during thanatosis (D). Fast exciter units are truncated in
A, B and E. Note that voluntary leg movements immediately after arousal
occurred in B but not in A and E.
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