Presentation on theme: "3.03 Remember the Structures, Functions, & Disorders of the Ears"— Presentation transcript:
1 3.03 Remember the Structures, Functions, & Disorders of the Ears
2 3.03 Remember the Structures, Functions, & Disorders of the Ears Essential Questions:What are the structures of the ears?What are the functions of the ears?What are some disorders of the ears?How are disorders of the ears treated?
4 Structures & Functions of the Ears OUTER EARMIDDLE EARAlso known as the tympanic cavityINNER EARAlso known as the labyrinth3.03 Remember the structures of the sensory system
5 Structures & Functions of the Ears Outer ear:PINNA- (aka: Auricle)collects sound wavessends them to canalAUDITORY CANAL-(aka: ear canal)Leads to eardrumLined with Ceruminous glands3.03 Remember the structures of the sensory system
6 Structures & Functions of the Ear Outer ear:CERUMINOUS GLANDS-Produce earwax (cerumen- lines & protects ear canal)TYMPANIC MEMBRANE-(aka: Eardrum)Between the outer and the middle eartransmits sound waves to the ossicles
7 Structures & Functions of the Ear Middle ear (Tympanic Cavity):OSSICLES-Tiny bones (3)Transmit sound waves from the eardrum to the inner earHAMMER (Malleus)ANVIL (Incus)STIRRUP (Stapes)
8 Structures & Functions of the Ear Middle ear (Tympanic Cavity):EUSTACHIAN TUBE-Connects the pharynx to the middle earEqualizes air pressure in the middle ear
9 Structures & Functions of the Ears Inner ear (Labyrinth):COCHLEA-“Organ of Hearing”Spiral-shaped passage of hearingContains the organ of CortiTransmits vibrations to the hearing center of the brain
10 Structures & Functions of the Ears Inner ear (Labyrinth):SEMICIRCULAR CANALS-Contain a liquid & delicate hair-like cellsBend when head & body movesSends messages to cerebellum to maintain balance/equilibrium
11 Structures & Functions of the Ears Label the Structures
12 Structures & Functions of the Ears PATHWAY OF HEARING:Sound waves ➢ Pinna (Outer ear) ➢ Auditory canal ➢ Tympanic membrane ➢ Ossicles (Hammer, Anvil, Stapes) ➢ Cochlea ➢ Cochlea nerve ➢ Temporal lobe of the Brain
14 Healthy Hearing WHAT ARE DECIBELS? HOW DO YOU PROTECT YOUR HEARING? The measurement of soundLoud noise for for too long will damage your hearingHOW DO YOU PROTECT YOUR HEARING?Turn down volumeEar plugsNoise-cancelling headphones
15 Disorders of the ear OTOSCOPE: Lighted instrument to view the ear OTOLARYNGOLOGIST: Specialist of the ear and throat
16 Disorders of the Ear EXTERNAL OTITIS: Inflammation of the ear canal Discuss what you see in this picture? (Besides a Q-tip!)What causes external otitis?Bacterial infection due to excessive water exposure, use of q-tipsHow can it be prevented?Proper ear care, avoid water
17 NORMAL TYMPANIC MEMBRANE Disorders of the EarOTITIS MEDIA:Infection of the middle earWho is most at risk of havingotitis media?Most common in children due to a short Eustachian tube; often a complication of the common coldSymptoms:Earache, pain, fever, drainage of fluid from the earWhat are the treatment options?Antibiotics, myringotomy (an opening put in the tympanic membrane), tubes in the earNORMAL TYMPANIC MEMBRANEOTITIS MEDIAMYRINGOTOMY
18 Disorders of the Ear OTOSCLEROSIS: Tube Insertion videoOTOSCLEROSIS:Inherited disorder; the stapes bone becomes spongy then hardensWhat is it?Oto- sclerosisWhy is a stapedectomy?Useful in treating otosclerosisHearing is re-routedOtosclerosis video
19 Disorders of the Ear MENIERE’S DISEASE: Semicircular canals of the inner ear are affected, causing vertigo (dizziness)What are the symptoms of Meniere’s disease?Vertigo, nausea, vomiting, tinnitus (ringing in the ears)What causes these symptoms?UnknownHow is it treated?Bedrest, medication, avoid salt, caffeine, nicotine, eat a balanced diet, plenty of H2O
20 Disorders of the Ear TINNITUS: What is Tinnitus? Ringing in the ears Tinnitus is a symptom, not a disorder.What is Tinnitis caused by?May be caused by impacted wax, otitis media, Otosclerosis, blockage of blood supply to the cochlea, loud noises
21 Disorders of the Ear Presbycusis: Deafness due to aging Who is most likely to develop Presbycusis?ElderlyCan be helped with hearing aides
22 What is the difference between conductive hearing loss and Disorders of the EarCONDUCTIVE HEARING LOSS:Due to wax or fluid build up that blocks sound to the inner earFluid in middle earAbnormal bone growthSENSORY HEARING LOSS:Caused by damage to parts of the inner ear or auditory nerveWhat is the difference betweenconductive hearing loss andsensory hearing loss?How can they be treated?
23 Testing for hearing loss Rinne testWeber testCompare these two tests.How are they diagnostic?
24 Structures, Functions & Disorders of the Ear THE END