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Science 1 June 1990:
Vol. 248. no. 4959, pp. 1118 - 1119
DOI: 10.1126/science.2343316
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Articles

Science, Vol 248, Issue 4959, 1118-1119
Copyright © 1990 by American Association for the Advancement of Science

articles

A structural basis for Hering's law: projections to extraocular motoneurons

AK Moschovakis, CA Scudder, and SM Highstein

Laboratory of Neural Control, National Institute of Neurological Diseases and Stroke, Bethesda, MD 20892.

Conjugate eye movements are executed through the concurrent activation of several muscles in both eyes. The neural mechanisms that underlie such synergistic muscle activations have been a matter of considerable experimentation and debate. In order to investigate this issue, the projections of a class of primate premotoneuronal cells were studied, namely, the vertical medium-lead burst neurons (VMLBs), which drive vertical rapid eye movements. Axons of upward VMLBs ramify bilaterally within motoneuron pools that supply the superior rectus and inferior oblique muscles of both eyes. Axons of downward VMLBs ramify ipsilaterally in the inferior rectus portion of the oculomotor nucleus and in the trochlear nucleus. Thus, VMLBs can drive vertical motoneuron pools of both eyes during conjugate vertical rapid eye movements; these data support Hering's law.


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