Nervous System: Eye + Ear
the clear tissue that covers the front of the eye
the transparent structure behind the pupil that changes shape to help focus images on the retina.
a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
tough, fibrous, white outer coat extending from the cornea to the optic nerve
Middle, vascular layer of the eye, between the retina and the sclera
innermost layer that perceives and transmits light to the optic nerve
The Nerve that carries impulses from the retina to the brain
ring of muscle behind the peripheral iris that controls the power of the lens
retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision
neurons in the retina that are responsible for color vision
A hole in the retina where the optic nerve fibers exit the eye.
the lining of the eyelids and the covering of the sclera
flap of the ear; the protruding part of the external ear, or pinna
also called the tympanic membrane
the area that sound waves pass through to reach the eardrum
a coiled, bony, fluid-filled tube in the inner ear through which sound waves trigger nerve impulses
middle part of the inner ear in front of the semicircular canals and behind the cochlea that contains the utricle and saccule
fluid filled canals structure of the inner ear involved in maintaining balance
any error of refraction in which images do not focus properly on the retina
eye disease in which the lens becomes covered in an opaque film that affects sight, eventually causing total blindness.
increased intraocular pressure results in damage to the retina and optic nerve with loss of vision
loss of central vision
the sensation of dizziness
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.
partial or complete hearing loss