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28 Cards in this Set
- Front
- Back
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general sense
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simple neural pathways
touch, temperature, pain chemical and pressure detection |
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special sense
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complex pathways
taste, smell, vision, hearing, equilibrium |
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What is the range of visible light?
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400-750 nm
<400 UV light, kills cells >750 too little energy, infrared |
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lateral and medial commissure
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upper and lower lids meet
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lacrimal caruncle
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red fleshy globe-like nodule in the medial commissure that contains sebaceous and sweat glands
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palpebrae
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eyelids
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palpebral fissure
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space between eyelids
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palpebral conjunctiva
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thin mucus membrane that covers the underside of the eyelids
secretes mucus to reduce friciton and moisten the eyeball surface |
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tarsal plate
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contributes to shape and support of the eyelids
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levator palpebrae superioris muscle
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lifts upper eyelids
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III (Oculomotor):
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superior rectus, medial rectus, inferior rectus, inferior oblique
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IV (Trochlear):
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Superior oblique
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VI (Abducens):
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Lateral rectus
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tunica fibrosa
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fibrous layer
sclera and cornea provides protection |
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tunica vasculosa
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vascular layer
choroid, ciliary body, and iris provides NOURISHMENT |
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tunica interna
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internal layer
retina and optic nerve converts light to nerve signal and sends it to the occipital lobes of the brain |
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sclera
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white part of the eye
covers the eyeball EXCEPT the cornea attachment point of extrinsic muscle of the eye resists punctures and protects the eye |
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cornea
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clear, curved portion covering the pupil
most responsible for bending of light to focus towards the back of the eye many layers of collagen |
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choroid
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contains melanin that absorbs light to prevent reflection back into eyeball, which can cause blurred vision
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ciliary body
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contains ciliary process and ciliary muscle
helps adjusting the lens for near and far vision |
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iris
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pigmented portion around central aperture called the pupil
constricts and dilates to regulate the amount of light striking the retina |
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retina
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contains 2 layers:
-outer pigmented layer prevents ligh scattering and absorbs light -inner neural layer contains 2 types of photoreceptors rods and cones |
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rods
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determine motion and general shape
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cones
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determine color vision and visual acuity
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macula lutea
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lateral to the optic disc
area of high cone density contains small depression known as fovea centralis, which is the area of sharpest vision |
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lens
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find tunes bending of light to focus image
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anterior cavity
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contains watery fluid known as aqueous humor
aqueous humor helps maintain the internal pressure of the lens |
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posterior cavity
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contains vitreous humor (jelly-like)
prevents eyeball from collapsing |
