The naso-ciliary nerve is a sensory branch of the ophthalmic cranial nerve (V1).
It has several sensory branches:
- To the ciliary ganglion, which may also contain some postganglionic sympathetic fibres from the internal carotid plexus.
- Long ciliary nerves to the eye, which may also contain some sympathetic fibres.
- Ethmoidal nerves, which exit through the medial wall of the orbit to supply para-nasal air sinuses, the nasal cavity and skin of the nose.
- Infra-trochlear nerve, which exits the orbit medially, where it is sensory to the medial part of the upper eyelid and nose.