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{{BioPsy}}
 
{{Infobox Nerve |
 
{{Infobox Nerve |
 
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Image = Gray777.png |
 
Image = Gray777.png |
Caption = Nerves of the orbit, and the ciliary ganglion. Side view. |
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Caption = Nerves of the orbit, and the [[ciliary ganglion]]. Side view. (Nasociliary is at center.) |
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Image2 = Gray858.png |
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Caption2 = Nerves of septum of nose. Right side. (Nasociliary is rightmost yellow line.) |
 
Innervates = |
 
Innervates = |
 
BranchFrom = [[Ophthalmic nerve]] |
 
BranchFrom = [[Ophthalmic nerve]] |
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The '''Nasociliary Nerve''' (nasal nerve) is intermediate in size between the [[frontal]] and [[lacrimal]], and is more deeply placed.
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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.
   
 
==Path==
 
==Path==
It enters the orbit between the two heads of the [[Rectus lateralis]], and between the superior and inferior rami of the [[oculomotor nerve]].
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The nasociliary nerve enters the orbit between the two heads of the [[lateral rectus muscle]]s and between the superior and inferior rami of the [[oculomotor nerve]] (CN III). It passes across the [[optic nerve]] (CN II) and runs obliquely beneath the [[superior rectus muscle]] and [[superior oblique muscle]] to the medial wall of the [[orbital cavity]]. After giving the [[anterior ethmoidal nerve]], it terminates as the [[infratrochlear nerve]] on the medial margin of the orbit.
   
It passes across the [[optic nerve]] and runs obliquely beneath the [[Rectus superior]] and [[Obliquus superior]], to the medial wall of the [[orbital cavity]].
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==Tests==
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Since the long ciliary nerves carry the afferent limb of the corneal [[blink reflex]], one can test the integrity of the nasociliary nerve (and, ultimately, the [[trigeminal nerve]]) by examining this reflex in the patient. Normally both eyes should blink when either conjuntiva is irritated. If neither eye blinks, then either the ipsilateral nasociliary nerve is damaged, or the [[facial nerve]] (CN VII, which carries the efferent limb of this reflex) is bilaterally damaged. If only the contralateral eye blinks, then the ipsilateral facial nerve is damaged. If only the ipsilateral eye blinks, then the contralateral facial nerve is damaged.
   
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]].
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==Branches==
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The nasociliary nerve gives off the following branches:
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* [[posterior ethmoidal nerve]]
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* [[long ciliary nerve]]s
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* [[infratrochlear nerve]]
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* [[long root of the ciliary ganglion|communicating branch to the ciliary ganglion]] (long root of the ciliary ganglion)
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* [[anterior ethmoidal nerve]]
   
It supplies internal nasal branches to the [[mucous membrane]] of the front part of the [[septum]] and lateral wall of the [[nasal cavity]].
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''PLICA'' is a mnemonic often used to remember these branches.
   
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]].
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==Additional images==
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<gallery>
==Branches==
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Image:Gray193.png|Base of the skull. Upper surface.
The nasociliary nerve gives off the following branches, viz.: the [[long root of the ciliary ganglion]], the [[long ciliary nerves]], the [[infratrochlear nerve]], and the [[ethmoidal nerves]].
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Image:Gray775.png|Plan of oculomotor nerve.
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Image:Gray776.png|Nerves of the orbit. Seen from above.
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Image:Gray778.png|Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion.
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Image:Gray780.png|The sphenopalatine ganglion and its branches.
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Image:Gray787.png|Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure.
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Image:Ciliary ganglion pathways.png|Pathways in the Ciliary Ganglion.
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</gallery>
   
 
==External links==
 
==External links==
* {{SUNYAnatomyFigs|29|03|08}}
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* {{SUNYAnatomyFigs|29|03|08}} - "A deeper dissection of the right orbit from a superior approach."
* {{NormanAnatomy|lesson9}}
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* {{NormanAnatomy|lesson9}} ({{NormanAnatomyFig|nasalseptumner}})
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* {{NormanAnatomy|cranialnerves}} ({{NormanAnatomyFig|V}})
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* {{LoyolaMedEd|GrossAnatomy/h_n/cn/cn1/cnb1.htm}}
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{{anatomy-stub}}
 
 
{{Gray's}}
 
{{Gray's}}
{{Nerves}}
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{{Trigeminal nerve}}
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{{enWP|Nasociliary nerve}}
 
{{enWP|Nasociliary nerve}}

Latest revision as of 18:57, December 31, 2007

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Nerve: Nasociliary nerve
Gray777
Nerves of the orbit, and the ciliary ganglion. Side view. (Nasociliary is at center.)
Gray858
Nerves of septum of nose. Right side. (Nasociliary is rightmost yellow line.)
Latin n. nasociliaris
Gray's subject #200 888
Innervates
From Ophthalmic nerve
To long root of the ciliary ganglion, the long ciliary nerves, the infratrochlear nerve, and the ethmoidal nerves
MeSH [1]

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.

PathEdit

The nasociliary nerve enters the orbit between the two heads of the lateral rectus muscles and between the superior and inferior rami of the oculomotor nerve (CN III). It passes across the optic nerve (CN II) and runs obliquely beneath the superior rectus muscle and superior oblique muscle to the medial wall of the orbital cavity. After giving the anterior ethmoidal nerve, it terminates as the infratrochlear nerve on the medial margin of the orbit.

TestsEdit

Since the long ciliary nerves carry the afferent limb of the corneal blink reflex, one can test the integrity of the nasociliary nerve (and, ultimately, the trigeminal nerve) by examining this reflex in the patient. Normally both eyes should blink when either conjuntiva is irritated. If neither eye blinks, then either the ipsilateral nasociliary nerve is damaged, or the facial nerve (CN VII, which carries the efferent limb of this reflex) is bilaterally damaged. If only the contralateral eye blinks, then the ipsilateral facial nerve is damaged. If only the ipsilateral eye blinks, then the contralateral facial nerve is damaged.

BranchesEdit

The nasociliary nerve gives off the following branches:

PLICA is a mnemonic often used to remember these branches.

Additional imagesEdit

External linksEdit


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. Template:Trigeminal nerve

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