Figure 3.

Recordings from TTX experiments Recordings were obtained from an MG motor unit after 2 months of axon conduction blockade and nerve crush. TTX flow to the implanted cuff was stopped 2 days before the terminal experiment was performed. A, motoneuron antidromic action potential. B, average records (10 sweeps) of motor unit EMG potential and membrane potential from the same motoneuron as in A following intracellular stimulation. The records show that this motoneuron had reinnervated muscle fibres and that motor terminals released sufficient ACh to activate muscle fibres.