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Vocbulary of the special senses

iris the pigmented, involuntary muscle that acts as the diaphragm of the eye.
sclera the firm white fibrous outer layer of the eyeball; protects and maintains eyeball shape.
lacrimal gland the tear producing gland
conjunctiva the thin, protective mucous membrane lining in the eyelids and covering the anterior surface of the eyeball
optic nerve either of the second pair of cranial nerves, which carry sensory information relating to vision from the retina of the eye to the brain
lens the elastic, doubly convex structure in the eye that focuses the light entering the eye on the retina.
cornea the transparent anterior portion of the eyeball.
pupil an opening in the center of the iris through which light enters the eye
aqueous humor the watery fluid in the anterior chambers of the eye cornea juice
vitreous humor the clear gelatinous substance that fills the eyeball between the retina and the lens.
optic disc a small oval-shaped area on the retina marking the site of entrance into the eyeball of the optic nerve or the blind spot
retina light sensitive layer of the eye; contains rods and cones.
choroid the pigmented nutritive layer of the eye.
suspensory ligament fibrous ligament that holds the lens in place in the eye
rod one of the two types of photosensitive cells in the retina.
cone one of the two types of photoreceptor cells in the retina of the eye. Provides for color vision.
photoreceptor specialized receptors cells that respond to light nergy
fovea centralis a small depression near the center of the retina, constituting the area of most acute vision
refraction the ability of the eye to bend light so that an image is focused on the retina
magnification the process of enlarging the size of something
astigmatisma visual defect resulting from irregularity in the lens or cornea of the eye causing the image to be out of focus
hyperopia farsightedness
myopia near sightedness
pinna outer projecting portion of the ear
tympanic membrane the eardrum
eustation tube the tube that links the pharynx to the middle ear
malleous a small bone in the ear used to pick up vibrations from the eardrum and then transfers it to the anvil
incus passes the vibration from the malleous to the stapes.
stapes the vibration comes here from the incus and makes this press against the oval window
oval window (round window) when pressed against by the stapes it gets the fluid in the inner ear into motion eventually activating the hearing receptors
cochlea houses the hearing receptors 1 of the 3 subdivisions of the bony labyrinth
semicircular canals 1 of the 3 subdivisions of the bony labyrinth that help with balance
vestibule the cavity between the cochlea and the semicircular canals
auditory nerve either of the eighth pair of cranial nerves that divides to form the cochlear nerve and that vestibular nerve
equilibrium (as it pertains to balance) a state where oppisite reactions or forces counteract each other
tinnitus A buzzing, ringing, or whistling sound in one or both ears occurring without an external stimulus. Its causes include ear infection or blockage, certain drugs, head injury, and neurologic disease.
chemoreceptor the receptors for taste and olfaction
olfactory receptor receptors for the sense of smell
olfactory nerve the nerve that transmits impulse about smell to the cortex of the brain
taste bud receptor cells for the sense of taste
Created by: Justen Rhyne