Edinger-Westphal Nucleus

The Edinger-Westphal nucleus is a small part of the brain located in the midbrain region. It plays a key role in controlling eye functions, particularly the pupil’s size and focusing ability. When you look at something close or bright light, this nucleus helps the muscles that constrict the pupil to make adjustments. It also influences the muscles that control the eye's lens curvature for focusing. Essentially, it’s an important control center for reflexes related to eye and pupil responses, helping your eyes adapt smoothly to different lighting and focusing needs.