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The sources of monosynaptic input to "fast" and "slow" abducens motoneurons (MNs) were revealed in primates by retrograde transneuronal tracing with rabies virus after injection either into the distal or central portions of the lateral rectus (LR) muscle, containing, respectively, "en grappe" endplates innervating slow muscle fibers or "en plaque" motor(More)
We evaluated the two-dimensional distribution of superior colliculus (SC) neurons visualized after retrograde transneuronal transport of rabies virus injected into the lateral rectus muscle of rhesus monkeys to test whether the density of projection neurons might play a role in the spatiotemporal transformation and vector decomposition. If this were the(More)
Omnipause neurons (OPNs) are inhibitory neurons located in the midline region of the caudal pons. Their role in gating the discharges of saccade-related burst neurons is well known, but there is no agreement concerning their influence on brainstem neurons that control other muscle groups participating in rapid gaze shifts. In the present study, we inquired(More)
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