Presentation on theme: "Chapter 35 Special Senses Medical Assisting"— Presentation transcript:
1Chapter 35 Special Senses Medical Assisting PowerPoint® presentation to accompany:Medical AssistingThird EditionBooth, Whicker, Wyman, Pugh, Thompson
2Learning Outcomes35.1 Describe the anatomy of the nose and the function of each part.35.2 Describe how smell sensations are created and interpreted.35.3 Describe the anatomy of the tongue and the function of each part.35.4 Describe how taste sensations are created and interpreted.
3Learning Outcomes (cont.) 35.5 Name the four primary taste sensations and the acknowledged fifth taste sensation.35.6 Describe the anatomy of the eye and the function of each part, including the accessory structures and their functions.35.7 Trace the visual pathway of through the eye and to the brain for interpretation.35.8 Identify ways that patients can practice preventive eye care.
4Learning Outcomes (cont.) 35.9 State ways that vision changes with age.35.10 List the medical professionals involved in diagnosis and treatment of visual disorders, including the roles that each play in patient care.35.11 List treatments for eye visual disorders.35.12 Describe the causes, signs and symptoms, and treatments of various diseases and conditions of the eye.
5Learning Outcomes (cont.) 35.13 Describe the anatomy of the ear and the function of each part.35.14 Explain the role of the ear in maintaining equilibrium.35.15 Explain how sounds travel through the ear and are interpreted in the brain.35.16 State ways that hearing changes with age.
6Learning Outcomes (cont.) 35.17 List the types of hearing loss and how they differ.35.18 Describe treatments for ear and hearing disorders.35.19 Explain how patients can be educated about preventive ear care.35.20 Describe the causes, signs and symptoms, and treatments of various disorders of the ear and hearing.
7Introduction Special senses Sensory receptors located in head Nose – smellTongue – tasteEyes – visionEars – hearing and equilibriumTouch is a generalized senseStimulus nervous system brain response
8Nose and Sense of Smell Olfactory receptors Chemoreceptors – respond to changes in chemical concentrationsChemicals must be dissolved in mucusLocated in the olfactory organ
9Nose and Sense of Smell (cont) Smell sensationActivation of smell receptors information sent to olfactory nervesthat send the information along olfactory bulbs and tractsto different areas of the cerebrum;cerebrum interprets the information as a particular type of smell
10Nose and Sense of Smell (cont.) Sensory AdaptationChemical can stimulate receptors for limited timeReceptors fatigue and stop responding to chemicalNo longer smell order
11Very Good! Apply Your Knowledge You notice an odor coming from a patient when you enter the exam room. Why would the patient not be able to smell it?ANSWER: After a few minutes, smell receptors undergo sensory adaptation and no longer respond to the chemical, and the patient can no longer smell the odor.Very Good!
12Tongue and Sense of Taste Gustatory receptors – located on taste budsTaste budsLocationPapillae of the tongueRoof of mouthWalls of throat} fewer than on tongueTongue
13Tongue and Sense of Taste (cont.) Taste cells and supporting structuresOn taste budsSupporting structures fill in spaceTaste cellsChemoreceptorsChemicals in food and drink must be dissolved in saliva to activateTongue
14Tongue and Sense of Taste (cont.) Unami5th basic tasteGlutamic acidSpicy foodsActivate pain receptorsInterpreted by brain as “spicy”Taste sensation4 primarySweet – tipSour – sidesSalty – tip and sidesBitter – backTongue
16Tongue and Sense of Taste (cont.) Taste sensationActivation of taste cellsCranial nervesGustatory cortex of cerebrum interprets information
17Apply Your Knowledge Great Job! What are the four primary taste sensations and where are their corresponding taste cells located?ANSWER: The four primary taste sensations are:Sweet – concentrated on the tip of the tongueSour – concentrated on the sides of the tongueSalty – concentrated on the tip and sides of the tongueBitter – concentrated on the back of the tongueGreat Job!
18Eye and Sense of Sight Vision system Eye Eyes Optic nerves Vision centers in the brainAccessory structuresEyeProcesses light to produce imagesThree layersTwo chambersSpecialized parts
19Eye and Sense of Sight (cont.) Outer – scleraWhite of the eyeProtects the eyeSense receptorsCorneaFront of eye“Window” that allows light into eyeBends light as it entersEye
20Eye and Sense of Sight (cont.) Ciliary bodyMusclesControls the shape of the lensLensPosterior to irisFocuses light on retinaAccommodationMiddle – choroidContains blood vesselsIrisColored part of eyeMuscle that contracts and relaxes to open or close pupilRegulates the amount of light that enters the eyeEye
21Eye and Sense of Sight (cont.) Inner – retinaVisual receptorsRodsSensitive to lightWill function in dim light – “limited” night visionDo not provide sharp image or detect colorConesFunction in bright lightSensitive to color and provide sharp imagesOptic disc – optic nerve enters retinaEye
22Eye and Sense of Sight (cont.) Chambers of the eyeAnterior chamberFront of lensFilled with aqueous humor – nourishes and bathes anterior eyePosterior chamberBehind lensContains vitreous humor – maintains shape of eyeball and holds retina in placeEye
24Eye and Sense of Sight: Visual Accessory Organs Eye orbitsEye socketsForm a protective shell around the eyesEyebrows protect eyesEyelidsSkin, muscle, and connective tissueBlinkingPrevents surface from drying outKeeps foreign material out of eye
25Eye and Sense of Sight: Visual Accessory Organs (cont.) ConjunctivasMucus membranesLine inner surfaces of eyelidsLacrimal apparatusLacrimal glandsLateral edge of eyeballsProduce tearsNasolacrimal ductsMedial aspect of eyeballsDrain tears into nose
26Eye and Sense of Sight: Visual Accessory Organs (cont.) Extrinsic eye musclesSix per eye move the eyeballSuperiorlyInferiorlyLaterallyMedially
27Eye and Sense of Sight: Visual Pathways Eye works like a cameraLight enters the eye through the lensRefraction – cornea, lens, and fluids bend light to focus it on the retinaOptic chiasmImage upside down on retinaImage turned right-side upOccipital lobe of cerebrumRetina converts light to nerve impulseOptic nerve
28Eye Safety and Protection 90% of eye injuries are preventableEye safety practicesAdequate lighting / handrailsPad or cushion sharp edges on furnitureToys should be age-appropriateDo not mix chemicalsProper protective wearGogglesSports eye guards
29Out of Sight! Apply Your Knowledge ANSWER: Matching: ___ Middle layer of eye A. Lacrimal glands___ Eye sockets B. Aqueous humor___ Control shape of lens C. Retina___ Outer layer of eye D. Sclera___ Anterior chamber E. Vitreous humor___ Tears F. Ciliary body___ Bending of light G. Choroid___ Posterior chamber H. Orbits___ Inner layer of eye I. RefractionHFOut of Sight!DBAIEC
30The Aging Eye Eyelids may droop Quality and quantity of tears decrease Conjunctiva thins and eyes may become dryerCornea yellows, fat deposits around itBrown spots on scleraPupils become smallerLens denser and more rigidLens yellowsRetinal changes – vision fuzzyChanges in ability of eye to adapt to lightImpaired night visionDecreased peripheral vision; depth perceptionFloaters or flashes of light
31Preventing Falls in the Elderly Falls can result in fractures of major bonesComplications of falls can lead to deathProne to fallingVision problemsPoor healthSlower reflexesPatient educationSafety checklistPrecautionsEquilibrium problemsMedication
32Nice job! Apply Your Knowledge What vision changes can occur in the elderly patient?ANSWER: An elder patient may have difficulty seeing because of drooping eyelids. Focusing may be more difficult because less light enters the eye. He may have difficulty distinguishing colors due to yellowing of the lens. Vision may be fuzzy because of changes in the retina. Night vision can become impaired. The patient may see floaters or “sparks.”Nice job!
33Vision Testing Professionals include Ophthalmologist – medical doctor who is an eye specialistOptometrist – provides vision screening and diagnostic testingOpticians – fills vision prescriptions for glasses and contacts
34Vision Testing: Screening Tests Myopia – impairment of distance visionEyeball is too longLight focuses anterior to retinaSnellen chartNormal vision20/20Hyperopia – impairment of near visionEyeball is shorterLight focused posterior to retinaTest using a handheld chart with various sizes of printPresbyopiaImpairment due to agingLoss of lens elasticity
35Vision Testing: Screening Tests (cont.) Contrast sensitivityDistinguish shades of grayTestingPelliRobson contrast sensitivity chartVistech Consultants vision contrast systemDetect cataracts or retinal problems before sharpness is impairedColor visionColor-blindnessMay be inheritedMore common in malesTestsIshihara color systemRichmond pseudoisochromatic color testDifficulties may indicate retinal or optic nerve disease
36Reyeght! Apply Your Knowledge What is the difference between myopia and hyperopia and what is presbyopia? What effect does each have on vision?ANSWER: If the patient has myopia, the eyeball is elongated and light focuses in front of the retina. She will have difficulty seeing far away. If she has hyperopia, the eyeball is shorter than normal and light focuses behind the retina. With presbyopia, the lens loses elasticity due to aging, resulting in the inability to see things close up.Reyeght!
37Treating Eye ProblemsDelicate organ – caution and sterile technique necessaryPatient education on preventive careAdministration of medicationsOnly ophthalmic medicationsAvoid touching dropper or ointment tube to the eyeEye irrigationSterile solutionPurposeRemove foreign materialRelieve discomfort
38Common Diseases and Disorders Disorder / DiseaseDescriptionAmblyopiaLazy eye; one eye is not used regularly; poor depth perception; often concurrent with strabismusAstigmatismCornea or lens has abnormal shape; blurred imagesCataractsOpaque structures in lens prevent light from passing through; vision fuzzyConjunctivitisPink eye; highly contagious bacterial infection
39Common Diseases and Disorders (cont.) Disorder / DiseaseDescriptionDry eye syndromeCommon problem; decreased production of oil in tearsEntropionInversion of lower eyelidGlaucomaIncrease in intraocular pressure due to a buildup of aqueous humor in anterior chamberHyperopiaFarsightedness
40Common Diseases and Disorders (cont.) Disorder / DiseaseDescriptionMacular degenerationProgressive disease; inadequate blood supply to retina; most common cause of vision loss; affects people over 50 yearsMyopiaNearsightednessNystagmusRapid, involuntary eye movements
41Common Diseases and Disorders (cont.) Disorder / DiseaseDescriptionPrespyopiaLoss of lens elasticity; develops with ageRetinal detachmentLayers of retina separate; medical emergencyStrabismusConvergentDivergentMisalignment of eyesCrossed eyes; one or both eyes turn inwardWall eye; one or both eyes turn outward
42Apply Your Knowledge Correct! It is okay to use any solution or medication in the eye?ANSWER: Only medications or solutions specifically designated for ophthalmic use may be used in the eyes. Medications not designated for the eye may be too concentrated or contain substances that can injure the eye. Solutions should be sterile and care must be taken not to contaminate the tip of the dropper or bottle.Correct!
43The Ear and the Senses of Hearing and Equilibrium: Structures External earAuricle (pinna)Collects sound wavesExternal auditory canalGuides sound wave to tympanic membraneTympanic membraneSeparates external canal and middle earVibrates when sound hits itEar
44The Ear and the Senses of Hearing and Equilibrium: Structures (cont.) Middle earEar ossiclesMalleusIncusStapesOssicles vibrate in response to vibration of tympanic membraneEustachian tubeConnects middle ear to throatEqualizes pressure on eardrumOval windowSeparates middle ear from inner earEar
45The Ear and the Senses of Hearing and Equilibrium: Structures (cont.) Inner ear – labyrinth of communicating chambersSemicircular canals – detect balance of the bodyVestibule – equilibriumCochleaHearing receptorsOrgan of Corti – organ of hearingEar
47The Ear and the Senses of Hearing and Equilibrium: Structures (cont.) Head movement causes fluid in semicircular canals and vestibule to moveEquilibrium receptors transmit information along vestibular nerves to cerebrumCerebrum determines if body needs to make adjustments
48The Ear and the Senses of Hearing and Equilibrium: Hearing Process Sound waves collectedWaves cause tympanic membrane to vibrateOssicles amplify vibrations, which enter inner earMovement of hairs lining cochlea trigger nerve impulsesImpulses are transmitted by auditory nerve to the brain for interpretation
49The Ear and the Senses of Hearing and Equilibrium: Hearing Process (cont.) Bone conductionAlternative pathwayBypasses external and middle ear directly to innerUseful in determining cause of hearing problem
50Apply Your Knowledge Supear! ANSWER: Matching: ___ Pinna A. Organ of Corti___ Malleus, incus, and stapes B. Cerumen___ Hearing receptors C. Ear ossicles___ Inner ear D. Tympanic membrane___ Organ of hearing E. Auricle___ Earwax F. Cochlea___ Eardrum G. Labyrinth___ Detect balance of body H. Semicircular canalsSupear!CFGABDH
51How to Recognize Hearing Problems in Children GuidelinesInfants to 4 monthsStartled by loud noisesRecognize mother’s voice4 to 8 monthsRegularly follow soundsBabble at people8 to 12 monthsRespond to the sound their nameRespond to “no”
52The Aging Ear External ear larger / earlobe longer Cerumen dryer and prone to impactionEar canal narrowerEardrum shrinks and appears dull and grayOssicles do not move as freelySemicircular canals less sensitive to changes in position – affects balance
53Apply Your KnowledgeWhat problem with the aging ear makes the elderly more prone to falls?ANSWER: The semicircular canals become less sensitive to change in position, which affects balance. This problem with equilibrium results in increased chance of falls in the elderly.Great Answer!
54Hearing Loss Symptom of a disease, not a normal part of aging Conductive hearing lossInterruption in transmission to inner earCausesObstruction of ear canalInfection of middle earReduced movement of stirrupSensorineural hearing lossSound waves not perceived by brain as soundCausesHereditaryRepeated exposure to loud noises / viral infectionsSide effect of medication
55Hearing Loss (cont.)Noise pollution – causes damage to sensitive cells in cochleaWorking with the hearing-impaired patientSpeak at a reasonable volume, in clear, low-pitched volumesFace the person; use hand gestures, if appropriateDo not overemphasize lip movementsHave patient repeat message to verify understandingTreat hearing-impaired patients with patience and respect
56Hearing and Diagnostic Tests Hearing testsTuning forks – differentiate between types of lossAudiometer – measures hearing acuityDiagnostic testingTympanometryMeasures the ability of the eardrums to moveDetects diseases and abnormalities of the middle ear
57Bravo! Apply Your Knowledge Identify the types of hearing loss based on the description below. What can be used to differentiate between the two?Answer:Conductive hearing loss Sensorineural hearing lossA tuning fork is a simple test to distinguish between types of hearing loss.Sound waves not perceived by brain as soundCausesHereditaryRepeated exposure to loud noises / viral infectionsSide effect of medicationInterruption in transmission to inner earObstruction of ear canalInfection of middle earReduced movement of stirrupBravo!
58Treating Ear and Hearing Problems Patient educationPreventative ear careAdminister ear medicationsMedications and IrrigationRelieve inflammation or irritation of canalLoosen and remove impacted cerumen or foreign body
59Treating Ear and Hearing Problems (cont.) Hearing aidsObtaining a hearing aidOtologist – medical doctor specializing in health of earAudiologist – evaluates and corrects hearing problemsCare and useBatteriesRoutine cleaningKeep dry and avoid hair spraysOther devices / strategiesAmplifiersClosed-captioningAppliances that light up as well as ring
60Common Diseases and Disorders Disorder / DiseaseDescriptionCerumen impactionBuild up of wax within external auditory canalHearing lossDeafnessMeniere’s diseaseDisturbance in equilibrium characterized by vertigo and tinnitus
61Common Diseases and Disorders Disorder / DiseaseDescriptionOtitisOtitis externaOtitis mediaOtitis internaInflammation of the earSwimmers’ earMiddle ear infection; common infectionLabyrinthitis; inner ear infectionOsteosclerosisImmobilization of the stapes; common cause of conductive hearing lossPresbycusisHearing loss due to aging process
62Apply Your Knowledge Excellent! F ANSWER: True or False: ___ An audiologist is a physician that specializes in ear health.___ Otitis media is also called swimmers’ ear.___ Presbycusis is hearing loss due to the aging process.___ Vertigo is ringing in the ears.___ Otitis interna is an inflammation of the labyrinth.___ Meniere’s disease is characterized by disturbances in equilibrium.___ Otosclerosis is the immobilization of the stapes.___ tinnitus is dizziness.otologistFexternaTExcellent!FTinnitusTTTFVertigo
63In Summary Special senses detect changes in the environment Each works with the nervous system to enable the body to cope with environmental changesMedical assistant’s knowledge of sensesProvide eye and ear care to patientPatient educationMeet needs of children, elderly, and patients with impairments
64End of ChapterEnd of Chapter 35Every closed eye is not sleeping, and every open eye is not seeing.~ Bill Cosby