Electrophysiological recordings were obtained from the chorda tympani nerve in calves during stimulation with NaCl, quinine hydrochloride, citric acid, acesulfam-K, aspartame, fructose, galactose, glucose, glycine, lactose, maltose, monellin, Na-saccharin, sucrose, thaumatin, and xylitol. In cattle the chorda tympani innervates the posterior third of the tongue as well as the anterior part. It was found that the posterior receptive field generally responded better to sweet substances than the anterior. Glycine and Na-saccharin followed by xylitol were the most effective sweet stimuli. The monosaccharides elicited larger responses than the disaccharides. Aspartame gave a weak nerve response in 5 of 13 calves. Monellin and thaumatin elicited no change in chorda tympani nerve activity and did not crossadapt with any sweetener. No effects on citric acid responses were observed after application of miraculin.
Bibliographical noteFunding Information:
This study was supported by the U.S. Department of Agriculture, HATCH project 5153, and NIH NS17021.
- Chorda Tympani Nerve