Ed·ing·er-West·phal nucleus ˌed-iŋ-ər-ˌwest-ˌfäl- -ˌfȯl-
: the lateral portion of the group of nerve cells lying ventral to the aqueduct of Sylvius which give rise to the autonomic fibers of the oculomotor nerve supplying the ciliary muscle and the sphincter pupillae
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