EBR EMS Chapter 9 Defintions
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| aqueous humor | watery fluid that fills the anterior chamber of the eye, in front of the lens
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| auricle | part of the ear attached to the side of the head
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| bony labyrinth | the fluid-filled complex maze of three spaces in the temporal bone
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| cataract | opacity of the lens of the eye
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| cerumen | ear wax
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| ceruminous gland | gland that produces a waxy substance called cerumen
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| chemoreceptor | receptors that respond to chemicals and are responsible for taste and smell
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| choroid | middle layer of the eyeball that contains a dark pigment to prevent the scattering of incoming light rays
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| cochlea | snail shell or structure of similar shape
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| conjunctiva | mucous membrance that lines the eyelids and covers the sclera
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| crista ampullaris | a specialized receptor located within the semicircular canals that detects head movements
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| endolymph | thick, clear fluid that fills the membranous labyrinth of the inner ear
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| eustachian tube | tube that connects the throat with the middle ear to equalize air pressure on both sides of the tympanum
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| external auditory canal | a curved tube extending from the auricle into the temporal bone, ending at the tympanic membrane
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| fovea centralis | small depression in the macula lutea where cones are most densely packed
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| glaucoma | disorder characterized by elevated pressure in the eye
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| gustatory cells | cells of taste
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| hyperopia | farsightedness
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| incus | middle ear bone that is shaped like an anvil
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| lacrimal gland | the glands that produce tears, located in the upper lateral portion of the orbit
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| lens | the refracting mechanism of the eye that is located directly behind the pupil
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| malleus | tiny middle ear bone that is shaped like a hammer
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| mechanoreceptor | receptors that are mechanical in nature
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| membranous labyrinth | a membranous sac that follows the shape of the bony labyrinth and is filled with endolymph
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| myopia | nearsightedness
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| optic disc | the area in the retina where the optic nerve fibers exit and there are no rods or cones; blind spot
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| organ of Corti | the organ of hearing located in the cochlea and filled with endolymph
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| ossicles | little bones found in the ears
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| papillae | small, nipple shaped elevations
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| perilymph | a watery fluid that fills the bony labyrinth of the ear
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| photopigments | chemicals in retinal cells that are sensitive to light
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| photoreceptor cell | specialized nerve cells stimulated by light
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| presbyopia | farsightedness of old age
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| proprioceptor | receptor located in the muscles, tendons and joints
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| pupil | the opening in the center of the iris that regulates the amount of light entering the eye
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| refraction | bending of a ray of light as it passes from a medium of one density to one of a different density
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| retina | innermost layer of the eyeball
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| sclera | white outer coat of the eyeball
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| 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
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| stapes | tiny stirrup shaped bone in the middle ear
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| tympanic membrane | eardrum
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| vestibular nervea | division of the vestibulocochlear nerve
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| vestibule | located in the inner ear and is the portion adjacent to the oval window between the semicircular canals and the cochlea
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| vitreous humor | the jellylike fluid found in the eye that is posterior to the lens
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