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49 Cards in this Set
- Front
- Back
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What are the general senses of touch |
Temperature Pressure Pain |
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What are the special senses |
Smell Taste Sight Hearing Equilibrium |
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Where are 70% of all sensory receptors |
In the eye |
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How many nerve fibers does each eye have |
Over a million |
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Where is most of the eye enclosed |
A bony orbit |
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What surrounds most pf the eye |
A cushion of fat |
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What are the accessory structures of the eye |
Eyelids and eyelashes Conjunctiva Lacrimal apparatus Extrinsic eye muscles |
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What gland lubricates the eye |
Tarsal gland |
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Where are cilliary glands located |
Between the eyelashes |
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What is conjunctivitis |
Pink eye |
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What is the conjunctiva |
Membrane that lines the eyelids |
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Where does the conjunctiva connect |
The surface of the eye |
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What fluid does the lacrimal gland produce |
Lacrimal fluid |
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What drains lacramal fluid from the eyes |
Lacrimal canals |
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What does the lacrimal sac do |
Provides passafe of Lacrimal fluid toward the nasal cavity |
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What does the nasolacrimal duct do |
Empties Lacrimal fluid into the nasal cavity |
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What is the function of the lacrimal apparatus |
Protect, lubricate and moisten the eye |
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What is lacrimal fluid |
Dilute salt solution (tears) |
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What does lacrimal fluid contain |
Antibodies and lysozymes |
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How many extrinsic eye muscles attach to the outer eye |
6 |
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Name the laters of the eye from outside to inside |
Fibrous layer Vascular layer Sensory layer |
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What is the sclera |
White connective tissue or seen as the white of the eye |
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What does the cornea allow |
Light to pass through |
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What is the only organ that can be replaced without fear of rejection |
The cornea |
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What is the choroid |
A blood-rich nutritive layer in posterior of the eye |
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What prevents light from scattering |
Pigment |
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How is the lens modified anteriorly |
Cillary body Iris |
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What is the cillary body |
Smooth muscle attached to the lens |
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What doe sthe iris do |
Regulates the amount of light entering the eye |
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What is the opening in the iris |
Pupil |
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What are the layers of the retina |
Outer pigmented layer Inner neural layer |
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What does the inner neural layer contain |
Photoreceptors |
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What are cones used for |
Color and bright light |
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What are rods used for |
Gray scale and low light |
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How do signals pass from photoreceptors |
Via a 2-neuron chain Bipolor neurons Ganglion cells |
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What doea the optic disc create |
A blind spot |
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What is tge optic disc |
Where the optic nerve leaves the eyeball |
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Where are rods mostly found |
Towards the edges of the retna |
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Where are cones densest |
In the center of the retina |
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What is the fovea contralis |
Area of the retina with only cones |
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How many types of cones are there |
3 |
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What differentiates these cones |
There sensitivy to different wavelengths of light |
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What is the result of a lack of a certain cone |
Color blindness |
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What are lens held in place by |
Suspensory ligament attached to the ciliary body |
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What is cataracts |
Lens becoming hard and opaque with age causing vision to become hazy and distorted |
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What is a opohthalmoscope |
An instrument used to illuminate rhe interior of the eye |
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What is accommodation |
The lens must change shape to focus on closer objects (less than 20 feet) |
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What is the optic chiasma |
The location where thr optic nerves cross |
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What are internal muscle reflexes of the eye controlled by |
The autonamic nervous system |
