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EBR EMS
EBR EMS Chapter 9 Defintions
| Question | Answer |
|---|---|
| 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 |
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