Term
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Definition
| a perpheral nerve ending or complete cell that responds to a particular type of stimulus |
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Term
| How are receptors classified? |
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Definition
1. location
2. stimulus
3. complexity |
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Definition
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Definition
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Definition
| sensitive to light energy |
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Term
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Definition
| sensitive to chemicals in solution |
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Definition
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Term
| touch is associated with the |
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Definition
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Term
| what to receptors for the special senses do? |
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Definition
| they transfer sensory information |
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Term
| what are the functions of the eyelids? |
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Definition
1. shade the eyes
2. protect the eyes
3. produce lacrimal fluid |
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Term
| what is the function of eyelashes? |
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Definition
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Term
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Definition
| infection of the hair follicle (eyelash) |
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Term
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Definition
| watery substance composed of water, salt, mucus, and lysozyme |
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Term
| what is the function of lacrimal fluid? |
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Definition
| clean, moisten, and lubricate the eye |
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Term
| how much lacrimal fluid is produced a day? |
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Definition
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Term
| how is lacrimal fluid spread? |
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Definition
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Term
| how is lacrimal fluid cleared? |
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Definition
| by evaporation or drainage into nasal cavities |
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Term
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Definition
| the excessive fluid production in response to overstimulation of the ANS |
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Term
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Definition
| foreign particles or inflammation of nasal mucosa |
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Term
| extrinsic eye muscles are classified as |
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Definition
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Term
| what are the functions of extrinsic eye muscles? |
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Definition
| they connect the eye to the orbital cavity and allow smooth, precise, rapid eye movements |
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Term
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Definition
| provides shape and protection to the inner eye |
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Term
| characteristics of the cornea |
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Definition
| transparent and nonvascular |
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Term
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Definition
| admits and refracts light |
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Term
| 75% of focusing occurs in the |
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Definition
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Term
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Definition
| nourishes the retina and absorbs scattered light |
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Term
| what does the ciliary body produce? |
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Definition
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Term
| function of the ciliary muscle? |
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Definition
| alters the shape of the lens |
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Term
| iris is composed of 2 parts: |
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Definition
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Term
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Definition
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Term
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Definition
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Definition
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Term
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Definition
| hole in the middle of the eye |
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Term
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Definition
| to regulate the amount f light entering the eye |
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Term
| functions of the conjunctiva |
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Definition
| lines the eyelids and covers the visible sclera |
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Term
| inflammation of the conjunctiva |
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Definition
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Term
| fucntions of the retinal tunic |
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Definition
| lines the posterior 3/4 of the eye |
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Term
| the retinal tunic is the only area of the body that |
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Definition
| permits a non-invasive examination of blood vessels` |
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Term
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Definition
| blind spot where the optic nerve exits the eye |
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Term
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Definition
| the visual portion of the eye |
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Term
| the neural portion of the eye is divided into.. |
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Definition
photoreceptor layer
bipolar layer
ganglion cell layer |
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Term
| photoreceptor layer contains |
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Definition
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Term
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Definition
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Term
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Definition
| composed of ganglion cells |
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Term
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Definition
| exit the eye as the optic nerve |
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Term
| remaining eye structures are |
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Definition
nonvascular
composed of layers of proteins
transparent |
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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
| interior of the eye is divided into... |
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Definition
| anterior and posterior cavities |
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Term
| anterior cavity is sub-divided into |
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Definition
| anterior and posterior chambers |
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Term
| anterior chamber is located |
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Definition
| behind the cornea and in front of the iris |
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Term
| posterior chamber is located |
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Definition
| behind the iris and in front of the lens |
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Term
| the anterior cavity is filled with |
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Definition
| a watery fluid called aqueous humor |
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Term
| aqueous humor is produced by what and how often? |
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Definition
| by the ciliary processes every 90 minutes |
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Term
| where is aqueous humor drained? |
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Definition
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Term
| acqueous humor functions/produces |
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Definition
f=nourishes the lens and cornea
p=intraocular pressure |
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Term
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Definition
| excessive pressure caused by excessive fluid in the eye |
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Term
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Definition
| jelly like substance formed in the embryonic period, cannot be replaced and found in posterior cavity |
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Term
| functions of vitreous humor |
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Definition
contributes to intraocular pressure
helps prevent the eye from collapsing
holds retina flush against the eye |
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Term
| image formation on the retina requires |
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Definition
| refraction, accomodation, and constriction |
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Term
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Definition
| inverted (upside down) and reverse |
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Term
| what does the brain coordinate? |
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Definition
| visial images with real objects |
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Term
| what part of the brain coordinates visual images? |
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Definition
| occipital lobe of the cerebrum |
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Term
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Definition
| when light rays enterin the eye are parallel |
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Term
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Definition
| when light rays entering the eye are diverging |
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Term
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Definition
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Term
| accommodation is the change in the |
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Definition
| curvature of the lens to adjust for vision at various distances |
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Term
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Definition
| light rays are focused in front of the retina |
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Term
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Definition
| light rays are focused behind the retina |
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Term
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Definition
| loss of elasticity and accommodation power |
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Term
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Definition
| light rays focus as lines rather than points |
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Term
| rods vs. cones - how many? |
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Definition
rods - 120 million/eye
cones - 6 million/eye |
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Term
| rods vs. cones - what color vision? |
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Definition
rods - black & white
cones - color |
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Term
| rods vs. cones - what do you see? |
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Definition
rods - shapes and movements only
cones - visual acuity |
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Term
| rods vs. cones - where do they operate? |
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Definition
rods - operate in the absence of light
cones - only photoreceptor in the tovea centralis in macula |
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