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EBR EMS Chapter 9 Defintions

aqueous humor watery fluid that fills the anterior chamber of the eye, in front of the lens
auricle part of the ear attached to the side of the head
bony labyrinth the fluid-filled complex maze of three spaces in the temporal bone
cataract opacity of the lens of the eye
cerumen ear wax
ceruminous gland gland that produces a waxy substance called cerumen
chemoreceptor receptors that respond to chemicals and are responsible for taste and smell
choroid middle layer of the eyeball that contains a dark pigment to prevent the scattering of incoming light rays
cochlea snail shell or structure of similar shape
conjunctiva mucous membrance that lines the eyelids and covers the sclera
crista ampullaris a specialized receptor located within the semicircular canals that detects head movements
endolymph thick, clear fluid that fills the membranous labyrinth of the inner ear
eustachian tube tube that connects the throat with the middle ear to equalize air pressure on both sides of the tympanum
external auditory canal a curved tube extending from the auricle into the temporal bone, ending at the tympanic membrane
fovea centralis small depression in the macula lutea where cones are most densely packed
glaucoma disorder characterized by elevated pressure in the eye
gustatory cells cells of taste
hyperopia farsightedness
incus middle ear bone that is shaped like an anvil
lacrimal gland the glands that produce tears, located in the upper lateral portion of the orbit
lens the refracting mechanism of the eye that is located directly behind the pupil
malleus tiny middle ear bone that is shaped like a hammer
mechanoreceptor receptors that are mechanical in nature
membranous labyrinth a membranous sac that follows the shape of the bony labyrinth and is filled with endolymph
myopia nearsightedness
optic disc the area in the retina where the optic nerve fibers exit and there are no rods or cones; blind spot
organ of Corti the organ of hearing located in the cochlea and filled with endolymph
ossicles little bones found in the ears
papillae small, nipple shaped elevations
perilymph a watery fluid that fills the bony labyrinth of the ear
photopigments chemicals in retinal cells that are sensitive to light
photoreceptor cell specialized nerve cells stimulated by light
presbyopia farsightedness of old age
proprioceptor receptor located in the muscles, tendons and joints
pupil the opening in the center of the iris that regulates the amount of light entering the eye
refraction bending of a ray of light as it passes from a medium of one density to one of a different density
retina innermost layer of the eyeball
sclera white outer coat of the eyeball
semicircular canals part of the inner ear that contains a specialized receptor called crista ampullaris that generates a nerve impulse on movement of the head
stapes tiny stirrup shaped bone in the middle ear
tympanic membrane eardrum
vestibular nervea division of the vestibulocochlear nerve
vestibule located in the inner ear and is the portion adjacent to the oval window between the semicircular canals and the cochlea
vitreous humor the jellylike fluid found in the eye that is posterior to the lens
Created by: hjkruse



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