Abstract
This chapter elaborates the generation of rapid eye movements in the brainstem and cerebellum. Clinical observations on patients with gaze palsies and lesion and stimulation experiments in animals led to the identification of the paramedian pontine reticular formation as the immediate premotor structure for the generation of horizontal rapid eye movements and of the rostral interstitial nucleus of the MLF in the mesencephalic reticular formation for vertical eye movements. Short lead burst neurons provide direct input into the integrator and onto motoneurons. They give the eye displacement signal to move and, after integration, to hold the eyes in the new position. It is, therefore, important to show that the combined output of the short lead bursters can drive the motoneurons of the six eye muscles. Short lead bursters have isoburst curves, which in general are not families of straight lines as found in motoneurons. Such families of isoburst curves exploding from circles to straight lines are typical, with a great variety of patterns. In all these cases, families of approximately straight lines can be obtained, when pairs of short lead bursters with opposite patterns are combined in an inhibitory way.
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