This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
Edinger Westphal nucleus is located in: 
Select and explain. 
A. Midbrain, B. Pons, C. Medulla, D. Spinal cord
A: Midbrain
Answer: A: Midbrain 
Explanation: Ans. A. MidbrainThe Edinger-Westphal nucleus (accessory oculomotor nucleus) is the parasympathetic pre-ganglionic nucleus that innervates the iris sphincter muscle and the ciliary muscle. The paired nuclei are posterior to the main motor nucleus (oculomotor nucleus) and anterolateral to the cerebral aqueduct in the rostral midbrain at the level of the superior colliculus