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35 Cards in this Set
- Front
- Back
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what is the outer tough white fibrous layer of eyeball?
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sclera
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where do extraocular muscles insert?
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sclera
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what is the transparent anterior portion of the sclera?
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cornea
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what is the vascular layer of the eyeball?
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choroid
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what muscles provides accomodation of lens?
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ciliary muscle - part of ciliary body
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what is the function of ciliary processes?
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secrete aqueous humor
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what is the function of the iris?
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controls pupil size
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what is the region where optic nerve emerges?
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optic disk
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what is the area of retina with greatest amoundt of cone cells?
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fovea
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where is the fovea in relation to optic disk?
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fovea lateral to optic disk
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what is the area of retina that contains the fovea?
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macula tuea
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what holds up the lens?
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suspensory ligaments from the ciliary body
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what happens to the lens when ciliary muslce contracts?
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lens gets thicker and more refractive
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what is accomodation?
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focusing on near objects - when lens gets thicker
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where is the aqueous humor? What are the chambers and their lacations?
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anterior to the lens
CORNEA - anterior chamber - IRIS - posterior chamber - LENS |
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where is aqueous humor secreted?
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into posterior chamber
enters venous channels in anterior chamber |
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what is refraction? What does the light refract though in the eye?
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refraction is passage of light
light refracts through cornea - aq. Humor - lens - vitreous body |
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what do eye glasses correct?
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abnormal curvature of cornea - causes refractive errors
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frontal and maxillary sinuses are associated with _____ in the eye?
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frontal sinus - roof of orbit
maxillary sinus - floor of orbit |
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what forms the medial wall of orbit?
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ethmoid and sphenoid bones -
ethmoid air cells and nasal cavity |
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what forms the lateral wall of orbit?
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zygoma and sphenoid bones -
temporal fossa nd middle cranial fossa |
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what goes through optic canal?
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optic nerve
opthalmic artery |
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what goes through superior orbital fissure?
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superior ophtalmic vein
V1 (frontal, lacrimal, nasociliary) CN3 - oculomotor CN4 - trochlear CN6 - abducens |
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what goes through inferior orbital fissure?
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inferior opthalmic vein
V2 (infraorbital n. , zygomatic n. |
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what exit do supratrochlear and infratrochlear nerves use?
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no associated foramina
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which extraocular muscles origin in common tendon ring?
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all rectuses - sup, inf, lat, med
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where do superior and inferior oblique origin?
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superior oblique - back wall of orbit
inferior oblique - front wall of orbit |
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what innervates the extraocular muscles?
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SO 4 - LR 6 , rest 3
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what muscles elevate the eye?
what nerves? |
superior rectus (3)
inferior oblique (3) |
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what muscles depress the eye?
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inferior rectus (3)
superior oblique (4) |
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what muscles abduct the eye?
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superior oblique (4)
inferior oblique (3) lateral rectus (6) |
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what muscles adduct the eye?
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superior rectus (3)
medial rectus (3) inferior rectus (3) |
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what nerves innervate levator palbeble superioris?
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skeletal muscle - CN3
smooth muscle (superior tarsal muscle) - sympathetic nerves |
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what is the test for superior and inferior rectus?
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elevate and depress from ABducted position
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what is the test for superior and inferior oblique?
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elevate and depress from Adducted position
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