Naso-ciliary nerve

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The naso-ciliary nerve is a sensory branch of the ophthalmic cranial nerve (V1). It has several sensory branches:

  1. To the ciliary ganglion, which may also contain some postganglionic sympathetic fibres from the internal carotid plexus.
  2. Long ciliary nerves to the eye, which may also contain some sympathetic fibres.
  3. 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.
  4. Infra-trochlear nerve, which exits the orbit medially, where it is sensory to the medial part of the upper eyelid and nose.