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A group of interrelated nuclei found near the midline in the rostral midbrain. They include the oculomotor nucleus and the Edinger-Westphal nucleus, and they innervate somatic muscles, e.g., inferior rectus and levator palpebrae muscles, and visceral muscles (preganglionic parasympathetic axons to the ciliary ganglia) via the oculomotor nerve (CN III).
See also: complex
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