Where is the ciliary ganglion?
The ciliary ganglion is an important anatomic structure in the posterior orbit because sensory innervation to the anterior eye, parasympathetic axons for the iris to control pupil constriction, and sympathetic fibers pass through as well as sympathetic fibers that innervate the iris dilators and blood vessels. Located about 1 cm in front of the annulus of Zinn, the ciliary ganglion lies interposed between the optic nerve and lateral rectus on the lateral aspect of the ophthalmic artery. Only the parasympathetic fibers are thought to synapse in the ganglion.
