Nasociliary nerve
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| Nerve: Nasociliary nerve | ||
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| Nerves of the orbit, and the ciliary ganglion. Side view. (Nasociliary is at center.) | ||
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| Nerves of septum of nose. Right side. (Nasociliary is rightmost yellow line.) | ||
| Latin | n. nasociliaris | |
| Gray's | subject #200 888 | |
| From | Ophthalmic nerve | |
| To | long root of the ciliary ganglion, the long ciliary nerves, the infratrochlear nerve, and the ethmoidal nerves | |
The nasociliary nerve is a branch of the ophthalmic nerve. It is intermediate in size between the two other main branches of the ophthalmic nerve, the frontal nerve and the lacrimal nerve, and is more deeply placed.
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[edit] Path
It enters the orbit between the two heads of the Rectus lateralis, and between the superior and inferior rami of the oculomotor nerve.
It passes across the optic nerve and runs obliquely beneath the Rectus superior and Obliquus superior, to the medial wall of the orbital cavity.
Here it passes through the anterior ethmoidal foramen, and, entering the cavity of the cranium, traverses a shallow groove on the lateral margin of the front part of the cribriform plate of the ethmoid bone, and runs down, through a slit at the side of the crista galli, into the nasal cavity.
It supplies internal nasal branches to the mucous membrane of the front part of the septum and lateral wall of the nasal cavity.
Finally, it emerges, as the external nasal branch, between the lower border of the nasal bone and the lateral nasal cartilage, and, passing down beneath the Nasalis muscle, supplies the skin of the ala and apex of the nose.
[edit] Branches
The nasociliary nerve gives off the following branches:
- posterior ethmoidal nerve
- long ciliary nerves
- infratrochlear nerve
- communicating branch to the ciliary ganglion (long root of the ciliary ganglion)
- anterior ethmoidal nerve
PLICA is a mnemonic often used to remember these branches.
[edit] Additional images
 Base of the skull. Upper surface. |
[edit] External links
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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 As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
