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ch.13 the urr
terms
17
Bible Studies
2nd Grade
03/25/2011

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Term
auricle [pinna]
Definition
external structure located on both sides of the head. the auricle directs sound waves into the external auditory meatus
Term
external auditory meatus [canal]
Definition
short tube that ends at the tympanic membrane. the inner part lies within the temporal bone of the skull and contains the glands that secrete earwax[ cerumen]
Term
tympanic membrane [eardrum]
Definition
semitransparent membrane that separates the external auditory meatus and the middle ear cavity
Term
eustachian tube
Definition
connects the middle ear and the pharynx. it equalizes air pressure on boths ides of the eardrum
Term
ossicles
Definition
bones of the middle ear that carry soudn vibrations. the ossicles are composed of the malleus [hammer], incus [anvil], and stapes [stirrup]. the stapes connects to the oval window, which transmit the sound vibrations to the inner ear
Term
labyrinth [inner ear]
Definition
bony spaces within the temporal bone fo the skull. it contains the cochlea, semicircuclar canals, and vestibule
Term
cochlea
Definition
is snail shaped and contains the organ of hearing. the cochlea connects tot he oval window in the middle ear
Term
semicircular canals and vestibule
Definition
contains receptors and endolymph that help the body maintain its sense of balance
Term
mastoid bone and cells
Definition
located in the skull bone behind the external auditory meatus
Term
acoustic neuroma
Definition
benign tumor within the auditory canall growing from the acoustic nerve. may cause hearing loss
Term
ceruminoma
Definition
tumor of a gland that secretes earwax [cerumen]
Term
meniere disease
Definition
chronic disease of the inner ear characterized by dizziness and ringing in the ear and hearing loss
Term
otitis externa
Definition
inflammation of the outer ear
Term
otitis media [OM]
Definition
inflammation of the middle ear
Term
presbycusis
Definition
hearing impairment in old age
Term
tinnitus
Definition
ringing in the ears
Term
vertigo
Definition
a sense that either one's own body or the enviroment is revolving. may indicate inner ear disease
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