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Ophthalmic Nerve

Nervus ophthalmicus

For medical students2 min readUpdated 2026-10-10

The ophthalmic nerve is the first, purely sensory division of the trigeminal nerve. It is responsible for transmitting sensory information from the structures of the eyeball, lacrimal gland, nasal cavity, as well as the skin of the forehead and upper eyelid.

Fiber TypePurely sensory
SyntopyLateral wall of the cavernous sinus
Skull ExitSuperior orbital fissure

Topography and Course of the Ophthalmic Nerve

The first division of the trigeminal nerve, the ophthalmic nerve (n. ophthalmicus, V1), is entirely sensory. After branching off the trigeminal ganglion, the nerve courses anteriorly along the lateral wall of the cavernous sinus.

To exit the cranial cavity and reach its target structures, the ophthalmic nerve passes through the superior orbital fissure. Before dividing into its major terminal branches, it gives off a small but important branch to the dura mater — the tentorial branch (r. meningeus recurrens).

Frontal and Lacrimal Nerves

Within the orbital cavity, the ophthalmic nerve divides into three main trunks. Two of these are the frontal and lacrimal nerves.

The frontal nerve (n. frontalis) is the largest branch, heading toward the tissues of the forehead. It further divides into:

The lacrimal nerve (n. lacrimalis) provides sensation to the lacrimal gland and the tissues of the upper eyelid. An important anatomical feature is its communicating branch with the zygomatic nerve (r. communicans cum nervo zygomatico).

Nasociliary Nerve

The third major branch is the nasociliary nerve (n. nasociliaris). This is a complex trunk that provides sensory innervation to the eyeball and nasal cavity structures.

It gives rise to several crucial branches:

  1. Infratrochlear nerve (n. infratrochlearis).
  2. Long ciliary nerves (nn. ciliares longi).
  3. Communicating branch with the ciliary ganglion (r. communicans cum ganglio ciliare).
  4. Posterior ethmoidal nerve (n. ethmoidalis posterior).
  5. Anterior ethmoidal nerve (n. ethmoidalis anterior).

The anterior ethmoidal nerve has its own complex branching pattern, giving off the external nasal branch (r. nasalis externus) and internal nasal branches (rr. nasales interni). The latter are further subdivided into lateral nasal branches (rr. nasales laterales) and medial nasal branches (rr. nasales mediales).

Mnemonic

To easily remember the three main branches of the ophthalmic nerve, use the mnemonic FLN (Frontal, Lacrimal, Nasociliary).

Frequently asked questions

Which paranasal sinuses are innervated by branches of the ophthalmic nerve?

Branches of the ophthalmic nerve provide sensory innervation to the mucous membranes of the frontal and ethmoid sinuses.

  • Frontal nerve (n. frontalis) — runs along the superior wall of the orbit and gives off branches supplying the frontal sinus mucosa.
  • Nasociliary nerve (n. nasociliaris) — runs along the medial wall of the orbit and provides innervation to the ethmoid sinus mucosa.
What autonomic fibers travel within the communicating branch to the lacrimal nerve?

Postganglionic parasympathetic fibers travel within the communicating branch to the lacrimal nerve.

  • Communicating branch with the zygomatic nerve (r. communicans cum nervo zygomatico) — transmits fibers from the zygomatic nerve (n. zygomaticus) to the lacrimal nerve (n. lacrimalis).

These secretory fibers originate from the pterygopalatine ganglion (ganglion pterygopalatinum), travel hitchhiking through the maxillary nerve branches, and finally reach the lacrimal gland (glandula lacrimalis) to drive its parasympathetic secretion.

Which nerves directly provide sensory innervation to the cornea?

Sensory innervation to the cornea is directly supplied by the long ciliary nerves.

  • Long ciliary nerves (nn. ciliares longi) — branches of the nasociliary nerve (n. nasociliaris), which is the largest branch of the ophthalmic nerve.

These nerves approach the eyeball and provide general sensation to its structures, including the cornea, sclera, iris, and ciliary body.

Is the ophthalmic nerve a mixed or motor nerve?

No, the ophthalmic nerve (V1) is exclusively a sensory nerve.

Through which opening does the nerve exit the cranial cavity?

The ophthalmic nerve leaves the cranial cavity through the superior orbital fissure.

Which branch innervates the dura mater?

The dura mater is innervated by the tentorial (meningeal) branch (r. meningeus recurrens).

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