The Journal of comparative neurology
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Omnipause neurons (OPNs) are midline pontine neurons that are thought to be instrumental in the generation of saccadic eye movements. Inhibition of the tonically active OPNs is postulated to disinhibit the burst neurons that cause the saccadic discharge in motoneurons, leading to a saccade. To test whether the anatomical connections of OPNs are consistent with this scheme, we studied the efferent projections of the OPN region by using the technique of anterograde transport of tritiated amino acids. ⋯ Thus, there are direct projections from the OPN region to all areas known to contain burst neurons. In addition, OPNs also apparently have indirect access to the spinal cord and cerebellum. Many of the latter connections parallel the efferent projections of the superior colliculus.