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ch 14 special senses

A&P 2

tough, white outer covering that surrounds the eyball sclera
colored portion of the eye iris
center of the iris that control the amount of light entering the eye pupil
thin transparent tissue that covers the outer surface of the eye conjunctiva
located at the upper outer edge of each eye and produces tears lacrimal gland
inner corner of the eye that contains the lacrimal duct inner canthus
transparent, nonvascular layer covering the colored portion of the eye cornea
layer just beneath the sclera that contains extensive capillaries that provide blood supply to the eye choroid
colorless biconcave that aids in focusing images clearly lens
secretes aqueous humor and contains muscles for adjusting the lens to view near objects ciliary body
attach the lens and hold it in place, allows for proper focusing of the eye suspensory ligaments
third innermost layer of the eye that changes the energy of light rays into nerve impulses retina
responsible to visualizing colors, central vision, and vision in bright light cones
responsible for vision in dim light and peripheral vision rods
transmits impulses from the retina to the brain optic nerve
known as the blind spot of the eye because it contains no rods or cones optic disc
anterior chamber is filled with a fluid known as aqueous humor
posterior chamber is filled with a jelly like substance known as vitreous humor
inability to perceive visual colors sharply monochromatitism
lens of the eye becomes progressively cloudy, altering the perception of images, usually begins after the age of 50 cataracts
inflammation of the ucous membrane lining of the eye, also known as pink eye conjunctivitis
disruption of the corneal surface commonly caused by a foreign body corneal abrasion
occurs as a result of long term or poorly controlled diabetes causing scarring of the retina diabetic retinopathy
increased intraoccular pressure causing damage to the optic nerve glaucoma
bacterial infection of an eyelash follicle or sebaceous gland also known as a stye hordeolum
better clarity of distant objects, farsightedness hyperopia
better clarity of close objects, nearsightedness myopia
inadequate vision at night nyctalopia(night blindness)
occurs over the age of forty, when the lens cannot focus due to loss of elasticity resulting in farsightedness presbyopia
failure of the eyes to gaze in the same direction due to weakness of the muscles strabismus
instrument used to examine the external and internal structures of the eye ophthamascope
test that determines intraocular pressure tonometry
the visual part of the ear that includes the auricle, external auditory canal and ends at the tympanic membrane external ear
this portion of the ear contains the auditory ossicles, the eustacian tube and oval wondow middle ear
the three auditory ossicles (tiny bones) are malleus; incus and stapes
transmits sound from the tympanic membrane to the second auditory ossicle; shaped like a hammer malleus
transmits sounds from the malleus to the third auditory ossicle; shaped like an anvil incus
transmits sound from the incus to the inner ear; shaped like a stirrup stapes
bony structures of the inner ear vestibule; cochlear;semicircular canal
membranous structure of the inner ear utricle;saccule; cochlear duct; membranes of the semicircular canal
these membranous pouches aid in maintaining balance utricle and saccule
the true organ of hearing housed in the cochlea organ of Corti
pathway of sound vibrations pinna;external auditory canal;tympanic membrane;malleus;incus;stapes;oval window;cochlea;organ of corti;auditory nerve fibers;cerebral cortex
surgical incision into the tympanic membrane myringotomy
surgical repair of the eardrum with a tissue graft myringoplasty
inflammation of the middle ear otitis media
inflammation of the outer ear otitis external (swimmers ear)
ringing in the ear tinnitus
excessive earwax in the external ear canal impacted cerumen
inflammation of the mastoid process mastoidititis
perforation of the tympanic membrane rupture of the eardrum
process of measuring how well one hears at various frequencies audiometry
instrument used to examine the ear otoscope
examine using a tuning fork that compares bone conduction and air conduction Rinne test
examine using a tuning fork to detect whether a hearing loss is conductive loss or sensory loss Weber test
devices that amplify sound to provide more precise perception hearing aid
surgical insertion of small tubes to aid with drainage of fluid myringotomy with tubes
exophthalmia abnormal protrusion of the eyeball; as seen in Graves disease
hyphema bleed into the anterior chamber of the eye
light rays enter the eye and are transmitted through: cornea; aqueous humor; pupil; lens and the vitreous humor to the retina the process of vision
the retina transmits images to the optic nerve
abnormal curvature of the cornea resulting in blurry vision astigmatism
involuntary movements of the eye usually resulting from a neuological issue nystagmus
LASIK stands for laser in situ keratomileusis
procedure done to correct error of refraction lasik
surgical procedure done to relieve intraocular pressure in patients with glaucoma trabeculectomy
used to assist with visualizing a corneal abrasion fluorescein staining
removal of ear cartilage to allow the ears to sit closer to the head, considered a cosmetic procedure otoplasty
chronic inner ear disease due to an over accumulation of endolymph Menieres disease
signs and symptoms of Menieres disease vertigo, hearing loss, feeling of pressure or fullness inaffected ear, tinnitus
infection or inflammation or the labyrinth or inner ear Labyrinthitis
signs and symptoms of labyrinthitis vertigo, altered equilibrium, nystagmus and occasional neurosensory hearing loss
Created by: clarevoyant1019