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BIO161 - Eye

Where is the eye located? in the orbit
How is the eye held in place? 1) fat pads; 2) optic nerve from the posterior end
What is another name for the eyelid? What is the location called where the eyelids meet? palpebra; palpebral fissure
What is the purpose of the extrinsic ocular muscles? How many are there? fxn: to move the eye (to see, to scan); 6 muscles (3 pairs)
Where is the lateral rectus muscle located, what is it's function, what nerves are involved? location: temporal side; fxn: moves eye laterally; N: LR6, controlled by CN VI
What is the function and nerves involved for the superior oblique? fxn: depresses eye and turns it laterally; N: SO4, CN IV
Except for the lateral rectus and superior oblique, which nerve controls the remaining extrinsis ocular muscles? CN III
What are the structures in the anterior 1/6 of the eye? conjunctiva (bulbar & palpebral)and cornea
What is the conjunctiva? a mucous membrane that covers the superior & inferior anterior eyeball; it is also reflected into the eyelid
What is the cornea? It covers the anterior 1/6 of the eye; it is transparent (lets light through); has no blood supply
What is the only tissue that can be transplanted w/o a need for matching? cornea
What is the pupil? an opening surrounded by the iris; lets light through; size of pupil is determined by contraction & relaxation of the iris
What is the iris? a muscle; it 's the colored part of the anterior eye; controls the size of the pupil
What is the function of the lens? focuses light; transparent
What is the ciliary body? lies behind the iris; produces aqueous humor
What is the aqueous humor? the vitreous humor? aqueous humor: fluid fills anterior chamber of the eye, is produced by the ciliary body, is reabsorbed by the Schlemm; vitreous humor: located behind the lens, fills posterior chamber of the eye, is a jelly-like material, allows light to pass through
What are examples of drugs that affect the size of the pupil? cocaine dilates the pupils; heroin restricts the pupils
What are the 3 layers that cover the posterior 5/6 of the eye? (from outside to inside) sclera, choroid, retina
What is the sclera? a tough white coating that coeres the eyeball (the white of the eye)
What is the choroid? aka: uvea; it is the vascular layer; it extens anteriorly as the ciliary body; the ciliary body gives rise to the iris; the suspension ligaments coming from the ciliary body keep the lens in place
What is the retina? consists of a neural layer and a pigmented layer
What is the neural layer of the retina? contains neurons; the axons of the most posterior set of neurons form the optic nerve (CN II)
Where is the optic nerve located? it exits the eye at the optic disk (aka the blind spot) at exactly the posterior pole
What is the macula lutea? located near the center of the retina; contains the fovea centralis
What is the fovea centralis? located in the center of the macula lutea, it has the highest visual acuity; the rest of the area is peripheral vision
What are the internal structures of the eye, anterior to posterior? cornea, anterior chamber of the eye, pupil, iris, lens, cilliary body, vitreous humor
What eye disease is a result of a blockage in the aqueous humor pathway? glaucoma
Created by: debmurph