The effects of orofacial sensory input on spontaneously occurring and apomorphine-induced rhythmical jaw movements in the anesthetized guinea pig.
The effects of tonic mandibular loading (jaw depression) on spontaneously occurring and apomorphine (APO)-induced rhythmical jaw movements (RJMs) were examined in the anesthetized guinea pig. It was found that this type of perturbation significantly increased only the amplitude and burst duration of the masseter (jaw closer) EMG activity, whereas the frequency of RJMs was not changed. The data suggest that jaw closer muscle spindle or temporomandibular joint feedback does not strongly influence the activity of the neural networks responsible for determining the frequency of RJMs in the anesthetized guinea pig.
D000768:Anesthesia, General; D000818:Animals; D001058:Apomorphine / Q000494:pharmacology*; D004576:Electromyography; D005145:Face / Q000294:innervation*; D006168:Guinea Pigs; D008410:Masticatory Muscles / Q000187:drug effects / Q000502:physiology*; D009055:Mouth / Q000294:innervation*; D009119:Muscle Contraction; D010507:Periodicity; D012677:Sensation / Q000502:physiology
D001058:Apomorphine