Abstract
The extracellular responses of single sensory afferent cell bodies were recorded from the geniculate ganglion of the chicken following chemical, mechanical and thermal stimulation of the oral cavity using glass coated tungsten microelectrodes. Forty eight chemoreceptive units were identified from the anterior and posterior palate, and from the anterior mandibular area of the lower jaw. Their response characteristics to tyrode Ringer solution, distilled water, 0.05M hydrochloric acid, 0.5M sodium chloride, 1M fructose and 0.05M quinine hydrochloride were investigated. Only 5 units responded to a single stimulus and all of the other units responded to 2 or more stimuli. Thirty seven of the units which did not show single stimulus specificity did however respond best to one of the stimuli tested. The firing rates of these chemoresponsive units was slow, they showed little or no spontaneous activity and showed variable response patterns.
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