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9 / 26

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interval above superior orbital fissure, encircled by fibrous ring and bounded by heads of lateral rectus

nasociliary nerve

abducent nerve

oculomotor nerve (inferior and superior divisions)

ophthalmic vein

o

inserted by thin, wide tendons into scleral coat near cornea

two oblique muscles

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insert by thin wide tendons

o

attached to posterior half of eyeball

nasociliary nerve

o

branch of CN V1

o

gives off long ciliary to posterior eyeball

o

runs obliquely toward medial wall of orbit b/w superior oblique and medial rectus

o

small branch: anterior ethmoidal nerve

passes thru anterior ethmoidal foramen

enters cranial cavity, runs lateral to cribriform plate

enters ethmoid bone to read nasal cavity

supplies mucus membrane of nasal cavity

sends terminal twig to tip of nose as external nasal nerve

abducent nerve

o

goes to cavernous sinus

o

lateral to internal carotid artery on way to superior orbital fissure

o

applied to medial surface of lateral rectus

oculomotor nerve

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pierces dura b/w anterior and posterior clinoid processes

o

splits at superior orbital fissure

superior division

supplies levator palpebrae superioris and superior rectus

inferior division

medial rectus, inferior rectus and inferior oblique

sends parasymp fibers to ciliary ganglion

o

lateral to optic nerve

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sends off short ciliary nerves to posterior portion of eyeball

superior ophthalmic vein

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passes thru superior orbital fissure

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drains into cavernous sinus

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anastomoses with facial vein

optic nerve

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brain tract, surrounded by dura, arachnoid and pia

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central artery of retina enters nerve

runs in center of nerve

pierces sclera and reaches retina

ophthalmic artery

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arises from internal carotid artery

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lies inferior and lateral to optic nerve in optic canal

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reaches medial wall of orbit

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sends ciliary arteries to eyeball

facial approach

conjunctiva

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adherent to cornea, loosely attached to sclera

corners of orbit

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superior and lateral: lacrimal gland

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superior and medial: trochlea for superior oblique

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inferior and medial: origin of inferior oblique and lacrimal sac

human eyeball

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