Abstract
1. In the lightly anesthetized cats, ambiguus neurons were impaled with glass microelectrodes. Forty-seven neurons were identified as motoneurons by their antidromic activation from the vagal nerve.
2. Stimulation of the vagal nerve produced not only the antidromic spikes but also EPSPs and IPSPs polysynaptically.
3. Stimulation of the superior laryngeal nerve produced EPSPs followed by IPSPs. These responses were also polysynaptic.
4. Effects of repetitive stimulation of superior laryngeal nerve upon sizes of these EPSPs and IPSPs were studied.
