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32 Cards in this Set
- Front
- Back
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Conjunctiva
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Transparent mucous membrane that lines eyelids and anterior sclera
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Lacrimal apparatus
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consists of lacrimal gland and ducts that drain into nasal cavity
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What is the flow of tears |
Lacrimal Sac - nasolacrimal duct - inferior meatus of nasal cavity |
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Glaucoma
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a chronic condition of the eye that leads to increased intraocular pressures - damaging the optic nerve - blindness
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Outer Fibrous layer
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- Sclera - Cornea |
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Sclera |
“white of the eye”- posterior 5/6th of eye; supporting wall of eyeball; continuous with cornea
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Cornea |
transparent anterior 1/6th of eyeball; bends (refracts) light as it enters the eye
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Middle Vascular layer
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- Choroid - Ciliary Body - Iris - pupil |
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Choroid |
supplies blood to all layers of eye ball; absorbs light to prevent scattering of light
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Ciliary Body
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- Ciliary muscles (smooth)
- Ciliary processes - Ciliary Zonules (suspensory ligaments) |
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Ciliary Muscles |
controls shape of lens (accommodation) |
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Ciliary Processes |
forms and secretes aqueous humor
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Ciliary Zonules |
holds lens in position
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Iris |
colored part of eye that lies between cornea and lens
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Pupil |
opening that controls how much light enters the eye
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Inner Sensory layer
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- Retina Optic nerve (CN II)- axons of ganglion cells Optic disc aka “blind spot”- spot where optic nerve leaves the eye; lacks photoreceptors |
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Retina |
- Outer Pigmented layer
- Internueral layer location of photoreceptors; location where light is converted into electrical stimulus |
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Outer Pigmented layer
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absorbs light to prevent scattering
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Inner Neural layer
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Photoreceptors
bipolar cells ganglion cells |
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Photoreceptors |
-Rods: B+W; Night vision
-Cones: Color vision (Red, Green, Blue) |
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fovea centralis
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Area with highest density of cones = best visual acuity
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Optic disc
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aka “blind spot”- spot where optic nerve leaves the eye; lacks photoreceptors
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Posterior segment
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Contains vitreous humor “gel like” fluid
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Anterior segment
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Contains aqueous humor “plasma like” fluid continuously formed by ciliary processes; supplies nutrients and oxygen to lens and cornea
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What drains aqueous humor |
Drains via scleral venous sinus (canal of Schlemm)
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Where is light bent |
Light is bent, or refracted, by the cornea, aqueous humor, lens, and vitreous humor
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What are real images |
Real images are:Reversed from left to right Upside downSmaller than the object
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Myopia |
nearsightedness, eye focuses images in front of retina
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What forms the optic nerve |
axons of ganglion cells
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What happens during close vision |
the ciliary muscles contract which relax the tension in the ligaments and make the lens rounder and increase light refraction |
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Path of light |
pigmented layer neural layer optic nerve optic disk optic chaisma optic tract thalmus occiptal lobe |
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Where does light land |
visual cortex of occipital lobe |
