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34 Cards in this Set
- Front
- Back
White portion of the eye. Tough, Fibrous membrane which maitains the shape of the eyeball and serves as a protective covering for the eye.
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sclera
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Color portion of the eye.
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iris
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Center of the iris.
Controls the amount of light entering the eye, and its diameter is regulated by the relaxing and contracting of the iris. |
pupil
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Thin mucous membrane layer that lines the anterior part of the eye, which is exposed to air, and the inner part of the eyelids.
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conjunctiva
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Located at the upper outer edge of each eye (under the upper eyelid).
Produces tears. |
lacrimal gland
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Antibacterial enzyme which destroys microorganisms.
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lysozyme
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Tears drain through this duct.
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lacrimal duct
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The lacrimal duct is located at the __________ (inner edge) of the eye.
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canthus
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Continuous with the skin and cover the eyeball, keeping the surface of the eyeball lubricated and protected from dust and debris through their blinking motion.
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Upper and lower eyelids.
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Located along the edges of the eyelids. Protect the eyeball by prevventing foreign materials and/or insects from coming in contact with the surface of the eyeball.
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eyelashes
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A transparent, nonvascular layer covering the colored part of the eye (iris).
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cornea
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Located in the vascular middle layer of the eye. Contains 3 structures: iris, ciliary body, suspensory ligaments.
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choroid
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Three structures of the choroid.
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iris
ciliary body suspensory ligaments |
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Two sets of muscles within the iris.
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radial muscles
circular muscles |
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Muscles within the iris that dilate the pupil in dim light to allow more light to enter the eye.
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radial muscles
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Muscles within the iris that constrict the pupil in bright light to allow less light to enter the eye.
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circular muscle
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Posterior to the iris.
Colorless biconvex structure that aids in focusing the images clearly on the sensitive nerve cell layer called the retina. |
lens
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Located on each side of the lens.
Contains muscles that are responsible for adjusting the lens to view near objects. |
ciliary body
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Radiating from the ciliary body are numerous straight fibrils called _____________ that attach to the lens and hold it in place.
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suspensory ligaments
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Ability of the lens to clearly focus on objects at various distances.
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accommodation
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Innermost layer of the eye.
Changes the energy of the light rays into nerve impluses. |
retina
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Nerve cells which are highly specialized for stimulation by light rays.
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rods and cones
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Responsible for visualizing colors, central vision, and vision in bright light.
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cones
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Highest concentration of cones is in the ___________, a small depression located within the macula lutea.
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fovea centralis
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An oval, yellowish spot near the center of the retina.
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macula lutea
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When the image focuses directly on the fovea centralis, the sharpest image is obtained. This is known as _________.
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central vision
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Responsible for vision in dim light and for peripheral vision. Located at the outer edges of the retina.
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rods
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Impulses from the retina are transmitted through the______ to the brain where they are interpreted as vision.
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optic nerve
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Only part of the retina that is insensitive to light because it contains no rods or cones. Also known as the blind spot of the eye.
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optic disc
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Two cavities of the interior of the eye.
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anterior cavity
posterior cavity |
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The anterior cavity contains the _____, located in front of the lens and the _______, lcoated behind the lens.
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anterior chamber
posterior chamber |
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Clear, watery fluid which fills the anterior & posterior chambers.
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aqueous humor
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Clear, jellylike substance found in the posterior cavity that gives shape to the eyeball.
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vitreous humor
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Bending of light rays as they pass through the various structures of the eye to produce a clear image on the retina.
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refraction
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