oculomotor nucleus


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oculomotor nucleus

[¦äk·yə·lō′mōd·ər ′nü·klē·əs]
(neuroscience)
A nucleus in the floor of the midbrain that gives rise to motor fibers of the oculomotor nerve.
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The figure in the left side shows the dorsal side of the brainstem and it describes ischemic area including the bilateral oculomotor nucleus without CCN and right MLF.
The abducens has two types of neurons, motoneurons which supply the lateral rectus, and internuclear neurons, which project via the contralateral medial longitudinal fasciculus (MLF) to the contralateral oculomotor nucleus. Therefore, abducens motoneurons and the abducens internuclear neurons together encode horizontal, conjugate eye movements.[9]
Changes in the sympathetic or parasympathetic tone (neuronal activity) are brought up by changes via reflex mechanism (as in pupillary light reflex), emotional changes affecting the limbic system and the diencephalon specifically the hypothalamus, and the modulation of the neuronal activity in the midbrain specifically pretectal region and the Edinger-Westphal nucleus (accessory oculomotor nucleus).