Term
| What is the purpose of the senses? |
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Definition
| They allow you to interact with the environment. They receive sensations, nerves carry signals to the brain, and the brain interprets and then responds. |
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Term
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Definition
| Transmits signals from brain to eye |
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Term
| What is the lacrimal gland? |
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Definition
| Exocrine; tears-clean and moisten the eye |
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Term
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Definition
| Lines eyelids, can get a disease called "pink eye"-very catchy |
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Term
| How many layers does the eye have and what are they? |
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Definition
| 3; sclera, choroid coat, retina |
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Term
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Definition
| White part, connective tissue |
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Term
| What is the choroid coat? |
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Definition
| Middle layer with many blood vessels |
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Term
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Definition
| Innermost layer of nerve cells; translates light to impulses |
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Term
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Definition
| Circular, transparent front of sclera |
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Term
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Definition
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Term
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Definition
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Term
| What are most cones located? |
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Definition
| Fovea Centralis (back surface of retina)-small part of back |
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Term
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Definition
| "Lazy eye", early childhood; force weak eye to work by covering other eye; surgery sometimes; blindness in weak eye may occur if not treated before 9 years old |
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Term
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Definition
| Abnormal shape or curve of cornea which causes blurred vision; glasses/contact work |
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Term
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Definition
| "Fogs over eye" lens; caused by age, drugs, cortisone, prednisone, trauma. Glasses don't really help, replacement surgery fixes it |
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Term
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Definition
| "Pink eye", staph or strep (bacteria) cause it. Antibiotics (eyedrops) Characterized by swelling, pain, or pus |
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Term
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Definition
| Increase in intraocular pressure with in eye. Usually over age 40. Leading cause of blindness. Early signs: loss of night vision, mild aching. Treated with medication. |
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Term
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Definition
| Nearsightedness, focuses in front of retina |
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Term
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Definition
| Farsightedness, focuses behind the retina |
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Term
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Definition
| Loss of lens elasticity (farsightedness); older people |
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Term
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Definition
| Eyes don't focus or move together. Cross-eyed, muscle weakness, exercise or surgery to fix and covering bad eye. |
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Term
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Definition
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Term
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Definition
| Center of the iris where light passes through, can change size |
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Term
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Definition
| Adjustable in shape and it refracts light to focus on the retina |
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Term
| What is the aqueous humor? |
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Definition
| Clear, watery, fluid that fills the space between the cornea and iris |
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Term
| What is the vitreous humor? |
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Definition
| Clear jelly-like and behind the lens |
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Term
| What is the pinna or auricle? |
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Definition
| What people call their ears, part ouside |
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Term
| What is the auditory canal? |
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Definition
| Tube between outside and ear drum |
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Term
| What is the tympanic membrane? |
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Definition
| Eardrum separates external auditory canal and middle ear |
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Term
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Definition
| Contains 3 bones and is connected to throat via Eustachian tube |
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Term
| What are the 3 bones in the middle ear? |
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Definition
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Term
| What is the eustachian tube? |
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Definition
| Tube between throat and middle ear for the purpose of pressure equalization (external ear and middle ear) |
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Term
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Definition
| Barrier between the middle and inner ear. Stapes touches it- it leads to vestibule or entrance to cochlea and semicircular canals. |
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Term
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Definition
| Looks like a snail shell. Contains organ of corti-translates sounds to nerve impulses |
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Term
| What do the semicircular canals do and how many are there? |
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Definition
| Balance and equilibrium; 3 |
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Term
| How many types of hearing loss are there and what are they? |
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Definition
| 3; conductive, sensory, central |
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Term
| What is conductive hearing loss? |
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Definition
| Vibrations not getting through- earwax, perforated eardrum, missing bones- some are repairable |
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Term
| What is sensory hearing loss? |
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Definition
| Damage to inner ear or nerve, not usually repairable |
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Term
| What is central hearing loss? |
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Definition
| Brain damage, damage to hearing center. Stroke |
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Term
| What is meniere's disease? |
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Definition
| Degeneration of hair cells in cochlea |
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Term
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Definition
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Term
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Definition
| Middle ear infection. Ear ache of child |
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Term
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Definition
| Stapes is immobile and conductive hearing loss. Can install artificial stapes and restore hearing. |
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