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38 Cards in this Set
- Front
- Back
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bones of the orbit
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frontal
ethmoid lacrimal maxilla zygomatic sphenoid palatine |
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sclera
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maintains shape of eyeball
insertion of extraocular m peirced by optic n |
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cornea
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major refractive structure
transparent and avascular won't be rejected in transplants |
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fibrous tunic
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sclera
cornea |
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vascular tunic
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choroid
cillary body iris |
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choroid
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dense capillary plexus with pigment cells
btwn sclera and retina |
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cillary body
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produces aqueous humor
suspends the lens via zonule fibers contains cillary muscles |
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cillary muscles
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control lens shape
parasymp -> contraction -> dec tesion on zonule fibers -> inc lens curvature |
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iris
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highly pigmented diaphragm
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sphincter pubillae m & cillary m
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preganglionic parasympathetic from edinger-westphal nuc
synapase in cillary ganglion postganglionic fibers pass via short cillary V1 *pupil constriction & lens thickening for near vision |
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dilator pupillae & superior tarsal m
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sympathetic vis CN III & V1
dilate pupil adn widen palpebral fissure |
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nasolacrimal duct
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within nasolacrimal canal
carries lacrimal fluid to inferior nasal meatus |
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ophthalmic a
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branch of internal carotid
enters orbit via optic canal crosses optic n |
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central a of retina
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internal carotid
runs w/in dural sheath of optic n supplies retina enters optic n's inferior surface |
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lacrimal a
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internal carotid
supplies lacrimal gland, conjunctiva & eyelids as palpebral aa anastomoses w zygoaticoorbial & facial aa branches of external carotid |
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supraorbital a
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internal carotid
passes through supraorbial fissure supplies skin of forehead, scalp and frontal sinus |
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supratrochlear a
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internal carotidterminal branch
supplies skin & muscles of forehead, scalp & pericardium |
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dorsal nasal a
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internal carotidterminal branch
supplies lacrimal sac & skin of nose anastomses w external carotid via infraorbital |
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posterior and anterior ethmoidal aa
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internal carotid
supply ethmoidal air sinus, frontal sinus, lateral nasal wall, nasal septum, meningeal branches |
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infraorbital a
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external carotid
branch of maxillary branches w/in infraorbital canal to supply inferior rectus, inferor oblique & lacrimal sac anastomoses w/ dorsal nasal & facial |
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zygomatico-orbital a
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external carotid
branch of superficial temporal supplies orbicularis oculi m anastomoses w/ lacrimal a |
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facial a
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external carotid
anastomoses w/ dorsal nasal and infrorbital |
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transverse facial a
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external carotid
anastomoses w/ infaorbital and lacrimal aa |
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central vein of retina
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w/in optic nerve
drains into cavernous sinus or superior ophthalmic v |
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superior ophthalmic vein
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communicates w/ facial & supraorbital vv
passes through superior orbital fissure drains into cavernous sinus |
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inferior ophthalmic vein
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recieves blood from inferior & medial parts of orbit
connects w/ superior ophthalmic or drains via inferior orbital fissure into pterygoid plexus |
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sympathetic innervation of lacrimal gland
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vasoconstriction
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parasympathetic innervation of the lacrimal gland
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secretion
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Levator palpebrea
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raises upper eyelid
oculomotor |
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medial rectus
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adducts
oculomotor |
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lateral rectus
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abduction
abducent |
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superior rectus
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1 elevation
2 adduction 3 intorsion oculomotor |
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inferior rectus
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1 depression
2 adduction 3 extorsion oculomotor |
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superior oblique
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abduction, depression, intorsion
trochlear |
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inferior oblique
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abduction, elevation, extorsion
oculomotor |
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injury to greater petrosal n
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loss of lacrimation
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sympathetic nerve injury
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pupil constricion (miosis)
ptosis anhydrosis (lack of sweating) erythematosis (blushing) |
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parasympathetic nerve injury
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pupil dialation
loss of accommodation |
