Ophthalmic nerve

Nerve: Ophthalmic nerve
Oblique section through the cavernous sinus.
Nerves of the orbit, and the ciliary ganglion. Side view.
Latin	n. ophthalmicus
Gray's	subject #200 887
From	trigeminal nerve
MeSH	Ophthalmic+Nerve

The ophthalmic nerve (V₁) is one of the three branches of the trigeminal nerve, the fifth cranial nerve. Like the maxillary branch of the trigeminal nerve, the ophthalmic branch carries sensory fibers only.

Branches

• Nasociliary nerve
  • sensory root of ciliary ganglion
  • posterior ethmodial nerve
  • long ciliary nerve
  • infratrochlear nerve
  • anterior ethmoidal nerve
• lacrimal nerve
• frontal nerve
  • supratrochlear nerve
  • supraorbital nerve

Path

The ophthalmic nerve supplies branches to the cornea, ciliary body, and iris; to the lacrimal gland and conjunctiva; to the part of the mucous membrane of the nasal cavity; and to the skin of the eyelids, eyebrow, forehead, and nose.

It is the smallest of the three divisions of the trigeminal, and arises from the upper part of the trigeminal ganglion as a short, flattened band, about 2.5 cm. long, which passes forward along the lateral wall of the cavernous sinus, below the oculomotor and trochlear nerves; just before entering the orbit, through the superior orbital fissure, it divides into three branches, lacrimal, frontal, and nasociliary.

The ophthalmic nerve is joined by filaments from the cavernous plexus of the sympathetic, and communicates with the oculomotor, trochlear, and abducent nerves; it gives off a recurrent (meningeal) filament which passes between the layers of the tentorium.

Additional images

Nerves of the orbit. Seen from above.

Dermatome distribution of the trigeminal nerve

Pathways in the Ciliary Ganglion.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated.

External links

• MedEd at Loyola GrossAnatomy/h_n/cn/cn1/cnb1.htm
• Atlas of anatomy at UMich eye_33
• cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University) (V)

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