The Ciliary Ganglion is a small cluster of nerve cells located behind the eye, specifically in the orbit. It plays a crucial role in the autonomic nervous system, particularly in the control of eye functions. This ganglion is involved in the regulation of pupil size and the accommodation of the lens for focusing on objects at different distances. The Ciliary Ganglion receives input from the oculomotor nerve, which is responsible for eye movement. It sends out fibers to the iris and ciliary body, influencing the constriction of the pupil and the shape of the lens. This helps the eye adjust to varying light conditions and focus on nearby or distant objects.