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52 Cards in this Set
- Front
- Back
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general senses of touch |
temperature pressure pain |
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special senses |
smell taste sight hearing equilibrium |
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how many sensory receptors are in the eyes |
70% |
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how many nerve fibers does each eye have |
over a million |
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what is the eye enclosed in |
a bony orbit |
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what is the eye surrounded by |
a cushion of fat |
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accessory structures of the eye |
eyelids and eyelashes conjunctiva lacrimal apparatus extrinsic eye muscles |
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what lubricates the eye |
tarsal gland |
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where are ciliary glands located |
between the eyelashes |
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membrane that lines the eyelid |
conjunctiva |
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what secretes mucus to lubricate the eye |
conjunctiva |
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what connects to the surface of the eye |
conjunctiva |
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what produced lacrimal fluid |
lacrimal glands |
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what drains lacrimal fluid from eyes |
lacrimal canals |
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what provides passage of lacrimal fluid towards nasal cavity |
lacrimal sac |
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what empties lacrimal fluid into the nasal cavity |
nasolacrimal duct |
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what is the function of the lacrimal apparatus |
protects, moistens, and lubricates the eye empties into the nasal cavity |
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what are the properties of lacrimal fluid |
dilute salt solution (tears) contains antibodies and lysozyme |
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what are your extrinsic eye muscles and what do they do |
six muscles attached to the outer surface of the eye produce eye movements |
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layers forming the wall of the eyeball |
fibrous layer (outside layer) vascular layer (middle layer) sensory layer (inside layer) |
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white connective tissue layer |
sclera |
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seen anteriorly as the white of he eye |
sclera |
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transparent central anterior portion |
cornea |
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allows for light pass through and repairs itself easily |
cornea
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the only human tissue that can be transplanted without fear of rejection |
cornea |
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blood rich nutritive layer in the posterior of the eye |
choroid |
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what prevents light from scattering |
pigment |
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smooth muscle attached to lens |
cilliary body |
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regulates amount of light entering eye |
iris |
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pigmented layer that gives eye color |
iris
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rounded opening in the lens |
pupil |
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two layers of the retina |
outer pigmented layer inner neural layer |
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what does the inner neural layer contain |
receptor cells (photoreceptors) rods/cones |
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signals pass from photoreceptors via a |
two neuron chain (bipolar neurons, and ganglion cells) |
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signals leave through |
the retina toward the brain toward the optic nerve |
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blind spot |
optic disc |
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where the optic nerve leaves the eyeball |
optic disc |
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allow dim light vision and peripheral vision, where are they found |
rods (gray tones) toward the edges of the retina |
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allow for detailed color vision |
cones |
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area of the retina with only cones |
fore centralis |
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where are cones the densest |
center of the retina |
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lack of one cone type |
color blindesss |
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biconvex crystal like structure |
lens |
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held in place by a suspensory ligament attached to the ciliary body |
lens |
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when the lens becomes hard and opaque with age |
cataracts |
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anterior to the lens contains aqueous humor |
anterior (aqueous) segment |
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posterior to the lens contains vitreous humor |
posterior (vitreous) segment |
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watery fluid fond between the lens and cornea similar to blood plasma |
aqueous humor |
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helps maintain interocular pressure and provides nutrients for the lens and cornea |
aqueous humor |
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gel like substance posterior to the lens |
vitreous humor |
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prevents the eye from collapsing |
vitreous humor |
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helps maintain intraccular pressure |
vitreous humor |
