part of midbrain Edinger-Westphal nucleus 2021-03-18T11:05:43Z BTO:0006505 BrendaTissueOBO Marion The parasympathetic pre-ganglionic nucleus that innervates the iris sphincter muscle and the ciliary muscle. Alternatively, the term is often used to refer to the adjacent population of non-preganglionic neurons that do not project to the ciliary ganglion, but rather project to the spinal cord, dorsal raphe nucleus, lateral septal nuclei, lateral hypothalamic area and the central nucleus of the amygdala, among other regions. accessory oculomotor nucleus