Periodontal jaw reflexes induced by pressure stimulation to the upper incisor in the rat.
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概要
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The present experiments revealed that lingolabial repetitive pressurestimulation to the upper incisor evoked not only the tonic excitation but also the tonic inhibition of the masseter muscle in the rat. These reversed responses from the excitatory to the inhibitory reflex occurred depending on the background activity of the masseter muscle. When the background activity of the muscle was weak, the tonic excitatory reflex of the muscle was induced by pressure stimulation to the incisor. When the background activity of the muscle was strong, the tonic inhibitory reflex was elicited by the same pressure stimulation.<BR>Reflex responses of the masseter muscle were also changed by the intensity of pressure stimulation. Weak pressure stimulation induced the excitatory reflex in the low background activity of the masseter muscle, but elicited the inhibitory reflex in the high background activity of the muscle. Strong pressure stimulation induced, even if in the low background activity of the masseter muscle, an inhibitory phase of the long duration before the excitatory phase, and extended the duration of the inhibitory phase in relation to the development of an incereasing background activity of the muscle.<BR>Form above results, it is suggested that the excitatory and the inhibitory phases of the reflex were changed depending upon the state of the background activity of the masseter muscle and the stimulus intensity, and that overlapping of the excitatory and inhibitory phases caused many kinds of patterns of the periodontal jaw reflex.
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