Pathophysiology of @entity9663 and oromandibular XXXX .

@entity129 @entity1 @entity24987 @entity3520 @entity9663 @entity3519 @entity2798
The pathophysiology of reflexes mediated by the fifth and seventh @entity129 has been studied in 16 @entity1 with @entity9663 and oromandibular @entity3519 compared with normal age-matched subjects. The EMG activity of the @entity3520 in the periocular and jaw muscles was similar to that described in other muscles in @entity1 with generalized @entity24987 . The latency of the R1 and R2 components of the blink reflex and of the corneal reflex was normal. However, the amplitude and the duration of the R1 and R2 and the duration of the corneal reflex were increased. In some @entity1 the R1 component was also present on the side contralateral to the stimulus, while in normal subjects it was present only on the ipsilateral side. The excitability cycle of recovery of the R2 component of the blink reflex after a prior conditioning shock was enhanced in the @entity1 . There were no EEG potentials preceding @entity9663 in the @entity1 , although a Bereitschaftspotential was seen beginning some 500 ms prior to @entity2798 in the same individuals. Exteroceptive suppression in the contracting masseter and orbicularis oculi muscles was absent in 40 to 50 per cent of the @entity1 . The jaw jerk was present in all the @entity1 with normal latency. These results indicate that the neuronal arcs of the facial reflexes in @entity9663 and oromandibular @entity3519 are normal. However, there is an abnormal excitatory drive, perhaps from the basal ganglia, to the facial motoneurons and the interneurons which mediate the facial reflexes in the brainstem.
