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Special Senses
n/a
33
Anatomy
12th Grade
03/17/2014

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Cards

Term
Cornea
Definition
Refracts light, important in focusing light onto the retina
Term
Sclera
Definition
Maintains shape of eye and protects eye: also serves as site of extrinsic muscle attachment
Term
Iris
Definition
Controls amount of light passing through the pupil
Term
Ciliary body
Definition
changes shape of lens (accommodation) and secretes aqueous humor
Term
Choroid
Definition
Absorbs light: contains blood vessels for eye structures
Term
Retina
Definition
Absorbs light: detects light and forms image for transmission to brain
Term
Lens
Definition
Refracts light: important in accommodation
Term
Anterior cavity
Definition
Maintains shape of eye and refracts light through its aqueous humor
Term
Posterior cavity
Definition
Maintains shape of eye and refracts light through its vitreous humor
Term
Aqueous humor
Definition
Fills anterior cavity, helping to maintain shape of eye: refracts light, maintains intraocular pressure
Term
Vitreous humor
Definition
Fills posterior cavity and maintains intraocular pressure: lends shape to eye and keeps retina firmly pressed against choroid: refracts light.
Term
What do eyebrows and eyelashes offer?
Definition
protection against the entry of foreign particles to the pupil
Term
What do eyelids do?
Definition
Protect the anterior portion of the eye
Term
Lacrimal apparatus
Definition
contains the lacrimal glands that produce tears to bathe the eyeball and keep it moist
Term
Where are Cones most concentrated?
Definition
In the Fovea Centralis
Term
What is Rhodopsin?
Definition
A visual pigment that is used by both rods and cones to detect movement in the environment
Term
Optic disk
Definition
Where the optic nerve exits
Term
The blind spot
Definition
The portion of the retina where the optic disk is
Term
Refracting media
Definition
(Lens, cornea, aqueous humor, vitreous humor) Media that focus light rays and cause them to cnverge on the fovea centralis of the retina
Term
External visual field
Definition
The area served by an eye
Term
Strabismus
Definition
Condition in which the two eyes do not work together in a coordinated fashion, and the individual sees two images instead of one
Term
Myopia
Definition
The image forms in front of the retina, glasses with concave lenses are used to focus the image on the retina
Term
Hyperopia
Definition
The image forms behind the retina and is blurred. Glasses with convex lenses are used to focus the image on the retina
Term
Astigmatism
Definition
Light rays separate, and fall on different areas of the retina. An uneven lens corrects this
Term
Colorblindness
Definition
The inability of cones to react to certain colors of the spectrum.
Term
What are the three major portions of the ear?
Definition
External ear, the middle ear, and the internal ear
Term
What is the external ear called?
Definition
The pinna, or auricle
Term
What lies within the pinna?
Definition
The external auditory canal, through which sound vibrations pass
Term
External auditory meatus
Definition
The entry to the external auditory canal
Term
Tympanic membrane, or eardrum
Definition
Membranous structure at the proximal end of the external auditory canal
Term
What is the long, slender tube that leads from the Pharynx to the middle ear?
Definition
The Auditory (Eustachian) tube
Term
What is the snail-like structure contained within the internal ear?
Definition
Cochlea
Term
What is the fluid within the cochlea?
Definition
Perilymph
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