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26 terms

Nervous System: Eye + Ear

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Cornea
the clear tissue that covers the front of the eye
Lens
the transparent structure behind the pupil that changes shape to help focus images on the retina.
Iris
a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
Sclera
tough, fibrous, white outer coat extending from the cornea to the optic nerve
Choroid
Middle, vascular layer of the eye, between the retina and the sclera
Retina
innermost layer that perceives and transmits light to the optic nerve
Optic Nerve
The Nerve that carries impulses from the retina to the brain
Ciliary Body
ring of muscle behind the peripheral iris that controls the power of the lens
Rods
retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision
Cones
neurons in the retina that are responsible for color vision
Optic Disk
A hole in the retina where the optic nerve fibers exit the eye.
Conjuctiva
the lining of the eyelids and the covering of the sclera
Auricle
flap of the ear; the protruding part of the external ear, or pinna
Eardrum
also called the tympanic membrane
auditory canal
the area that sound waves pass through to reach the eardrum
Cochlea
a coiled, bony, fluid-filled tube in the inner ear through which sound waves trigger nerve impulses
Vestibule
middle part of the inner ear in front of the semicircular canals and behind the cochlea that contains the utricle and saccule
Semi-Circular Canal
fluid filled canals structure of the inner ear involved in maintaining balance
Ametropia
any error of refraction in which images do not focus properly on the retina
Cataracts
eye disease in which the lens becomes covered in an opaque film that affects sight, eventually causing total blindness.
Glaucoma
increased intraocular pressure results in damage to the retina and optic nerve with loss of vision
Macular Degeneration
loss of central vision
Vertigo
the sensation of dizziness
Tinnitus
a jingling; ringing or buzzing in the ear
Middle Ear Infection
An infection that occurs behind the eardrum, in the middle part of the ear.
Deafness
partial or complete hearing loss