Term
| What are suspensory ligaments? |
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Definition
| Suspends the lens behind the pupil and attaches to the ciliary body. |
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Term
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Definition
| Flexible structure located in the body of the eye between the pupil and the vitreous humor that focuses light rays entering through the pupil to form an image on the retina. |
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Term
| What happens to the lens when viewing near objects? |
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Definition
| Ligaments loosen tension on the lens and the lens becomes fatter. |
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Term
| What happens to the lens when viewing objects far away? |
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Definition
| Ligaments tighten, which increases the tension on the lens, making the lens thin. |
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Term
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Definition
| Clouding of the lens; can lead to reversable blindness |
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Term
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Definition
| Muscle; colored part of the eye; diaphragm which controls how much light enters by controlling the diameter of the pupil |
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Term
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Definition
| The central opening of the iris. |
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Term
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Definition
| Part of the sclera; admits light into the eye |
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Term
| What is the anterior cavity? |
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Definition
| Located between the lens and cornea; splits into 2 chambers. |
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Term
| What is the anterior chamber? |
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Definition
| Located between the iris and cornea, filled with aqueous fluid. |
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Term
| What is the posterior chamber? |
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Definition
| Located between the lens and iris and is filled with aqueous fluid. |
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Term
| What is the sclera sinus? |
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Definition
| Collects the aqueous fluid and rids it from the eyeball |
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Term
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Definition
| Caused by either overproduction of aqueous fluid or the sclera sinus is clogged, thus leading to too much aqueous fluid in the eye, which puts pressure on the retinal artery which can lead to permanent blindess. |
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Term
| What is the aqueous humor? |
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Definition
| A serous fluid secreted by the ciliary body into the anterior cavity. |
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Term
| What is the vitreous humor? |
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Definition
| Transparent jelly that fills the vitreous chamber behind the lens. Keeps the retina pressed against the inner surface of the vitreous chamber. |
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Term
| What 2 structures comprises the outer ear? |
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Definition
| Auricle (pinna) and auditory canal. |
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Term
| What 5 structures comprise the middle ear? |
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Definition
| Begins with the tympanic membrane, eustachian tube, auditory ossicles, stapedius and tensor tympani. |
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Term
| What 5 structures comprise the inner ear? |
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Definition
| The bony labyrinth, membranous labyrinth, basilar membrane, vestibular membrane, and spiral organ (organ of corti). |
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Term
| What is the auricle (pinna)? |
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Definition
| The cartilagenous, external, visible portion of the ear, minus the earlobe. |
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Term
| What is the auricle's function? |
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Definition
| To direct sound into the auditory canal. |
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Term
| What is the auditory canal? |
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Definition
| The passage through the temporal bone which starts at the external acoustic meatus and ends at the tympanic membrane. |
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Term
| What is the auditory canal's function? |
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Definition
| Protection of the middle and inner ear with guard hairs and cerumen. |
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Term
| What is the function of cerumen? |
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Definition
| It's sticky material coats the guard hairs which makes them more effective in BLOCKING FOREIGN MATERIAL from entering the auditory canal; contains lysozyme and has a low pH, which INHIBITS BACTERIAL GROWTH; WATERPROOFS the canal which keeps the skin and tympanic membrane from absorbing water. |
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Term
| What is the outer ear's function? |
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Definition
| Funnel for conducting airborne vibrations to the tympanic membrane. |
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Term
| What is the middle ear's function? |
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Definition
| Converts soundwaves into vibrations |
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Term
| What is the inner ear's function? |
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Definition
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Term
| What is the tympanic membrane? |
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Definition
| (Eardrum)Beginning of the middle ear; Closes the inner end of the auditory canal(outer ear) and separates it from the middle ear. |
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Term
| What is the eustachian tube? |
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Definition
| Normally flattened, closed tube. Opens when yawning and chewing which allows air to enter or leave the tympanic cavity. |
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Term
| What is the function of the eustachian tube? |
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Definition
| Plays a role in equalizing pressure from middle ear and outer ear. |
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Term
| What 3 bones comprise the auditory ossicles? |
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Definition
| Malleus, incus and stapes. |
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