See also my in-depth article about the ciliary ganglion.
Location
The ciliary ganglion lies within the lateral orbit between the optic nerve and lateral rectus muscle.
It is approximately 1 cm in front of the annulus of Zinn.
Nerves
From the cavernous sinus
Inferior division of CN III
Branch to inferior oblique muscle
Preganglionic parasympathetic pupillomotor fibers (cell bodies in Edinger-Westphal nucleus)
CN V1
Carries sensory input from cornea, orbit, and face to trigeminal ganglion
Postganglionic sympathetic pupillomotor fibers (to iris dilator)
To the eye
These nerves travel along the optic nerve and pierce the sclera around the optic nerve, traveling anteriorly between the choroid and sclera.
Short ciliary nerves
Postganglionic parasympathetic myelinated pupillomotor fibers (to iris sphincter)
Terminal branches of V1 for eye, orbit, and face
Long ciliary nerves
Postganglionic sympathetic pupillomotor fibers (to iris dilator)
Reference
Basic and Clinical Science Course, Section 2. Fundamentals and Principles of Ophthalmology. American Academy of Ophthalmology. San Francisco: 2018-2019 edition, 11-12.