Medical Terminology A Word-Building Approach Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice CHAPTER Seventh Edition Special Senses: The Ear 15

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Learning Outcomes State the description and primary functions of the ear. Analyze, build, spell, and pronounce medical words. Comprehend the drugs highlighted in this chapter. Describe diagnostic and laboratory tests related to the ear. Identify and define selected abbreviations.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Multimedia Directory Slide 6Ear Animation Slide 8Ear Virtual Tour Animation Slide 31Mechanics of Sound Animation Slide 38Audiology Video Slide 41Deafness Culture Video Slide 55Otitis Media Video

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Anatomy and Physiology Overview The ear is generally described as having three distinct divisions, each with distinct functions: –External ear –Middle ear –Inner ear The ear contains structures for both the sense of hearing and the sense of balance.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Anatomy and Physiology Overview Eighth cranial nerve: –Also called the acoustic or auditory nerve. –Carries nerve impulses for both hearing and balance from the ear to the brain.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Ear Animation Click on the screenshot to view an animation of the ear. The animation may take a moment before playing. Back to Directory

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.1 The ear and its anatomic structures.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Ear Virtual Tour Animation Click on the screenshot to view a virtual tour of the human ear. Back to Directory

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice External Ear The appendage on the side of the head consisting of: –Auricle or pinna –External acoustic meatus

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice External Ear Auricle (pinna): –Protects the tympanic membrane (eardrum). –Collects and directs sound waves through the ear canal to the eardrum. –Ear canal contains modified sweat glands that secrete cerumen, or earwax. –Too much cerumen can block sound transmission.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Middle Ear Separated from external ear by eardrum. An air-filled cavity (tympanic cavity) carved out of the temporal bone. This cavity contains three specialized small bones or ossicles that mechanically transmit sound vibrations: –malleus (hammer) –incus (anvil) –stapes (stirrup)

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Middle Ear During transmission, tympanic vibrations can be amplified as much as 22 times their original force.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.2 The ossicles of the middle ear along with the oval window and tympanic membrane.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Middle Ear The tympanic cavity connects to the throat/nasopharynx via the eustachian tube. This ear/throat connection makes the ear susceptible to infections, such as otitis media (OM) and mastoiditis. The eustachian tube equalizes air pressure to ensure the eardrum vibrates maximally when struck by sound waves.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations At 36 weeks, the ear lobes of the fetus are soft. Around 40 weeks, the fetus’s ear lobes become firm. In newborns, the wall of the ear canal is pliable because of underdeveloped cartilage and bone.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations The eustachian tube in infants is shorter and straighter than in older children and adults. –Because of this, an infant or young child is more predisposed to developing an ear infection. –When ear infection occurs, the child’s ears should be examined very carefully.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.3 To examine a child’s ear, the pinna should be pulled back and up for children over 3 years; the pinna should be pulled down and back for children under 3 years of age.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear Consists of a membranous labyrinth or mazelike network of canals located within a bony labyrinth. These structures are called labyrinths because of their complicated shapes.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear The bony labyrinth, located in the temporal bone, consists of the: –Cochlea –Vestibule –Three semicircular canals

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear The membranous labyrinth, separated from the bony labyrinth by fluid called perilymph: –is filled with a fluid called endolymph. –contains the actual hearing cells, the hair cells of the organ of Corti.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear Cochlea –Spiral-shaped bony structure containing the cochlear duct. –The spiral cavity of the bony cochlea is partitioned into three tubelike channels, which are formed by the:  Basilar membrane –Forms the lower channel or scala tympani. –Organ of Corti is located on the basilar membrane.  Vestibular membrane (Reissner’s membrane) –Forms the upper channel or scala vestibuli.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.4 The cochlea.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear Process of Hearing –Sound waves are directed to the eardrum, causing it to vibrate. –These vibrations move the three small bones of the middle ear (malleus, incus, and stapes). –Movement of stapes at oval window sets up pressure waves in the perilymph and endolymph.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear Process of Hearing –The waves cause vibration of hair cells of the organ of Corti. –These vibrations are picked up by auditory nerve fibers that transmit an electric nerve signal to the cerebral cortex of the brain, where it is interpreted as sound.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.5 Path of sound vibrations.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear Vestibule –A bony structure located between the cochlea and the three semicircular canals. –Contains the utricle and saccule, membranous pouches containing perilymph. –Utricle:  communicates with semicircular canals  contains hair cell sensory receptors connected to fibers from the eighth cranial nerve –These hair cells are a part of the sense of equilibrium.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear Semicircular Canals –Superior, posterior, and inferior semicircular canals are located at right angles to each other. –At the base of each canal is an enlargement called an ampulla containing nerve endings in the form of hair cells.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Inner Ear Semicircular Canals –Dizziness and motion sickness are associated with the continued movement of the fluid in the semicircular canals due to gravitational influences and the resulting sensory sensation in these areas.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Mechanics of Sound Animation Click on the screenshot to view an animation of the mechanics of sound. Back to Directory

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations With aging, changes occur in the external, middle, and inner ear. The skin of the auricle can become dry and wrinkled. Production of cerumen declines and is drier.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations Dryness of the external canal causes itching. Hairs in the external canal become coarser and longer, especially in males.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations The eardrum thickens, and the bony joints in the middle ear degenerate. Hearing loss, known as presbycusis, results from degenerative changes in the inner ear. Changes in the inner ear affect: –sensitivity to sound –understanding of speech –balance

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations Degenerative changes include atrophy of: –the cochlea –the cochlear nerve cells –the organ of Corti These changes lead to the hearing loss, presbycusis, that is common in the older adult.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations Noisy surroundings make it difficult for older adults to discriminate between sounds, thereby impairing communication and socialization. The hearing distance of older adults can also be impaired.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Acoustic Audiogram Audiologist Audiology Audiometer Audiometry audi/o -metry Audio Pronunciations = to hear = measurement

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Audiology Video Click on the screenshot to view a video on the topic of audiology. Back to Directory

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Audio Pronunciations Audiphone Auditory Aural Auricle Binaural Cerumen

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Cholesteatoma Cochlea Deafness Ear Electrocochleography Endaural end- aur -al Audio Pronunciations = within = ear = pertaining to

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Deafness Culture Video Click on the screenshot to view a video on the topic of deafness. Back to Directory

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.6 A child with a hearing impairment wears a hearing aid (as noted in his left ear).

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations Sustained noise over 85 decibels (db, dB) can cause permanent hearing loss. Risk doubles with each 5-decibel increase. About 2 in every 10 teens have lost some of their hearing ability from exposure to noise and are not aware of it.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations 17% of middle and high school students have some hearing loss. High-pitched sounds are the first to be affected by noise exposure. As hearing loss progresses, a person can start to have difficulty hearing, particularly when there is background noise.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations Excessive noise can permanently damage the hair cell sensory receptors of the organ of Corti. These receptors are instrumental in transmitting sound to the brain.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.7 Listening to loud music with headphones or at rock concerts is a frequent cause of hearing loss among teenagers and young adults.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Audio Pronunciations Endolymph Equilibrium Eustachian tube Fenestration Incus

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Audio Pronunciations Labyrinth Labyrinthectomy Labyrinthitis Labyrinthotomy Malleus Mastoidalgia

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Audio Pronunciations Mastoiditis Meniere’s disease Monaural Myringectomy Myringoplasty Myringoscope

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Myringotome Myringotomy Ossicle Otic Otitis Otitis media ot -itis Audio Pronunciations = ear = inflammation

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations Otitis media is often difficult to detect in children who do not yet have sufficient speech and language skills.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations Common signs of otitis media include: –Unusual irritability; fussiness. –Difficulty sleeping; night awakening. –Tugging or pulling at one or both ears. –Fever. –Fluid draining from the ear. –Loss of balance. –Unresponsiveness to quiet sounds, sitting too close to the T.V., or being inattentive.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Life Span Considerations Children age 2 and younger who attend day care centers are 36 times more likely to contract ear infections, pneumonia, and meningitis than stay-at-home children. Most middle ear infections are a result of an upper respiratory infection (URI) that has spread through the eustachian tube.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.8 This young child is pulling at the ear and acting fussy, two important signs of otitis media.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Otitis Media Video Click on the screenshot to view a video on the topic of otitis media. Back to Directory

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Otodynia Otolaryngologist Otolaryngology Otolith Otomycosis Otoneurology ot/o -lith Audio Pronunciations = ear = stone

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Audio Pronunciations Otopharyngeal Otoplasty Otopyorrhea Otorhinolaryngology Otosclerosis Otoscope Oval window

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure 15.9 Examination of ear using otoscope.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Perilymph Presbycusis Stapedectomy Stapes Tinnitus Tuning fork peri- -lymph Audio Pronunciations = around = serum, pale fluid

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Audio Pronunciations Tympanectomy Tympanic Tympanic thermometer Tympanitis Tympanoplasty Utricle Vertigo

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure Thermoscan thermometer. (Courtesy of Thermoscan, inc. San Diego, CA)

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure Use of the tympanic thermometer to measure body temperature.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Drug Highlights Analgesic Antipyretic Antibiotics –Penicillins –Cephalosporins –Tetracyclines –Erythromycin

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Drug Highlights Drugs Used to Treat Vertigo –Vertigo is a sensation of movement.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Diagnostic and Lab Tests Auditory-evoked response –Response to auditory stimuli (sound) that can be measured independently of the patient’s subjective response. –Use of an electroencephalograph can determine the intensity of sound and presence of response.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Diagnostic and Lab Tests Electronystagmography (ENG) –Recording eye movement in response to specific stimuli, such as sound.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Diagnostic and Lab Tests Pure tone audiometry –Method of testing pure tones by providing calibrated tones to a person via earphones, allowing that person to increase the sound level until it can just be heard. –Hearing tests of right and left ears are generally done independently. –The results of such tests are summarized in audiograms.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Diagnostic and Lab Tests Otoscopy –Visual examination of the external auditory canal and the tympanic membrane via an otoscope. Tuning fork test –Method of testing hearing by the use of a tuning fork. –Two types of hearing loss, conductive and perceptive, may be distinguished through the use of this test.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Diagnostic and Lab Tests Rinne Test –Uses a tuning fork to compare bone conduction hearing with air conduction. Tympanometry –Measurement of the movement of the tympanic membrane and pressure in the middle ear.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Figure Administration of the Rinne test.

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Abbreviations

Copyright ©2012 by Pearson Education, Inc. All rights reserved. Medical Terminology: A Word-Building Approach, Seventh Edition Jane Rice Combining Form Match Up Quiz 1.cochle/oa. maze 2.labyrinth/ob. snail 3.myring/oc. old 4.presby/od. eardrum 5.steat/oe. fat