Biomedical Engineering Reference
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Figure 5. CPG control of sensory inputs. (A) In response to a medial giant fiber (MGF) stimulation, an
intracellularly-recorded CBCO terminal (1) exhibits a large depolarization (2) accompanied by a strong
decrease in membrane input resistance (3). (B) During fictive locomotion, bursts of PADs time-locked to
depressor bursts occur in an intracellularly-recorded sensory neuron. (C) Superimposed intracellular
recordings showing the amplitude of the sensory spike and its motoneuronal EPSPs in the absence or
presence of a PAD. (D) Inhibition of antidromic spikes and large PADs under picrotoxin (PTX) perfu-
sion. (E) Motoneuronal responses to orthodromic and antidromic CBCO spikes. (F) Occurrence of three
CBCO antidromic units (AU) during free behavior, with AU1 discharging preferentially in the absence
of locomotor activity, and AU2 and AU3 being exclusively active when the animal moves. Arrowheads
designate stepping levator activity, and horizontal bar indicates postural adjustments.
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