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The Edinger–Westphal nucleus (accessory oculomotor nucleus, or visceral oculomotor nucleus) is one of two nuclei of the oculomotor nerve. It is located in the midbrain. It contributes the autonomic parasympathetic (i.e. visceral) component to the oculomotor nerve, providing innervation to the iris sphincter muscle and ciliary muscle to mediate the pupillary light reflex and accommodation, respectively. It is composed of parasympathetic pre-ganglionic cell bodies that synapse in the ciliary ganglion.
The term "Edinger–Westphal nucleus" also referred to what is now known as the centrally-projecting Edinger–Westphal nucleus, intermingled population of non-preganglionic neurons that do not project to the ciliary ganglion but to various regions throughout the central nervous system.