Key Terms The

NORMAL STRUCTURE AND FUNCTION

cerumen se-RU-men

The brownish, waxlike secretion formed in the external ear canal to protect the ear and prevent infection [adjective, ceruminous (se-RU-mi-nus)]

cochlea KOK-le-a

The coiled portion of the inner ear that contains the receptors for hearing (root cochle/o)

eustachian tube u-STA-shen

The tube that connects the middle ear with the nasopharynx and serves to equalize pressure between the outer and middle ear (root salping/o)

external auditory canal

Tube that extends from the pinna of the ear to the tympanic membrane; external auditory meatus

incus

ING-kus

The middle ossicle of the ear

labyrinth

LAB-i-rinth

The inner ear, named for its complex structure, which resembles a maze

malleus

MAL-e-us

The ossicle of the middle ear that is in contact with the tympanic membrane and the incus

ossicles OS-i-klz

The small bones of the middle ear, the malleus, incus, and stapes

organ of Corti

KOR-t_e

The hearing receptor, which is located in the cochlea

Normal Structure and Function, continued

pinna

The projecting part of the outer ear; auricle (AW-ri-kl)

PIN-a

semicircular canals

The three curved channels of the inner ear that hold receptors for

equilibrium

stapes

The ossicle that is in contact with the inner ear (root staped,

STA-pez

stapedi/o)

tympanic membrane

The membrane between the external auditory canal and the middle

tim-PAN-ik

ear (tympanic cavity); the eardrum. It serves to transmit sound waves

to the ossicles of the middle ear (root myring/o, tympan/o).

vestibular apparatus

The portion of the inner ear that is concerned with the sense of equi-

ves-TIB-u-lar

librium; consists of the vestibule and the semicircular canals (root

vestibul/o)

vestibule

The chamber in the inner ear that holds some of the receptors for

VES-ti-bul

equilibrium

vestibulocochlear nerve

The nerve that transmits impulses for hearing and equilibrium from

ves-tib-u-lo-KOK-le-ar

the ear to the brain; eighth cranial nerve

TABLE 18-2 Roots Pertaining to the Ear and Hearing

ROOT

MEANING

EXAMPLE

DEFINITION OF EXAMPLE

audi/o

hearing

audition aw-DISH-un

act of hearing

acous, acus, cus

sound, hearing

acoustic a-KU-stik

pertaining to sound or hearing

ot/o

ear

oto toxic o-to-TOKS-ik

poisonous or harmful to the ear

myring/o

tympanic membrane

myringotome mi-RING-go-tom

knife used for surgery on the eardrum

tympan/o

tympanic cavity (middle

tympanometry

measurement of transmission

ear), tympanic membrane

tim-pa-NOM-e-tre

through the tympanic membrane and middle ear

salping/o

tube, eustachian tube

salpingoscopy sal-PING-gos-ko-pe

examination of the eustachian tube

staped/o,

stapes

stape dectomy

excision of the stapes

stapedi/o

sta-pe-DEK-to-me

labyrinth/o

labyrinth (inner ear)

labyrinthotomy lab-i-rin-THOT-o-me

incision of the inner ear (labyrinth)

vestibul/o

vestibule, vestibular

vestibulopathy

any disease of the vestibule of

apparatus

ves-tib-u-LOP-a-the

the inner ear

cochle/o

cochlea of inner ear

retrocochlear ret-ro-KOK-le-ar

behind the cochlea

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