Nerve
Ophthalmic nerve (V1)
Trigeminal sensation from the eye and upper face
High-yield
Corneal sensation reaches the brainstem through the nasociliary pathway of V1. Reflex blinking uses facial-nerve output to orbicularis oculi on both sides.
Overview
V1 leaves the superior portion of the trigeminal ganglion and travels in the lateral cavernous-sinus wall. Its frontal, lacrimal and nasociliary branches enter the orbit through the superior orbital fissure. Together they carry sensation from the eye, upper face and parts of the nasal cavity, sinuses and cranial dura.
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Reference facts
- Origin
- Sensory neurons in the trigeminal ganglion, with V1 emerging as its superior division.
- Course
- Along the lateral cavernous-sinus wall, then through the superior orbital fissure as the frontal, lacrimal and nasociliary branches.
- Motor
- No trigeminal skeletal motor component. Some peripheral branches also carry autonomic fibers that originate in other pathways.
- Sensory
- Cornea, conjunctiva, upper eyelid, forehead and anterior scalp, nasal bridge and tip, and parts of the nasal and sinus lining. Meningeal branches supply parts of the cranial dura, including the tentorium.
Mnemonic
V1 has three main orbital branches: Nasociliary, Frontal and Lacrimal - NFL.
Clinical correlation
Shingles in the V1 distribution can affect the eye. Nasal-tip or nearby nasal lesions suggest nasociliary involvement and greater risk of ocular complications, but their absence does not exclude eye disease.
Frequently asked questions
Where does the ophthalmic nerve (V1) arise?
Sensory neurons in the trigeminal ganglion, with V1 emerging as its superior division.
What muscles does the ophthalmic nerve (V1) supply?
No trigeminal skeletal motor component. Some peripheral branches also carry autonomic fibers that originate in other pathways.
What is the sensory distribution of the ophthalmic nerve (V1)?
Cornea, conjunctiva, upper eyelid, forehead and anterior scalp, nasal bridge and tip, and parts of the nasal and sinus lining. Meningeal branches supply parts of the cranial dura, including the tentorium.
What is the course of the ophthalmic nerve (V1)?
Along the lateral cavernous-sinus wall, then through the superior orbital fissure as the frontal, lacrimal and nasociliary branches.