The Outer Ear SPA 4302 Summer 2004.

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Presentation transcript:

The Outer Ear SPA 4302 Summer 2004

External Auditory Canal lateral portion-cartilage medial portion-osseous lined with epidermal (skin) tissue hairs grow in lateral part cerumen (ear wax) secreted in lateral part. Usually curved.

Outer Ear Functions 1 Amplification / Filtering -- increases sounds between 1500 and 7000 Hz by 10 to 15 dB -- produced by resonance of Concha -- 5000 Hz E.A.Canal -- 2500 Hz

Outer Ear Functions 2 Protection -- medial displacement of ear drum -- curvature of canal -- hairs -- cerumen -- skin migration

Outer Ear Functions 3 Localization -- The ability to identify the location of a sound source

Otoscopy Viewing outer ear and TM Looking for: Landmarks, Evidence of infection Other Anomalies

Lateral Process (Malleus) = Annulus Malleus Manubrium Umbo Cone of Light

Epidermal migration produces “wrinkles”

Disorders: Blockage: with earwax, foreign bodies, pus. Otitis Externa: swimmer's ear. Fungal or Bacterial in origin. More frequent in ears with small canal openings that cannot dry out as easily. This is also sometimes a problem for people wearing hearing aids.

Otitis Externa

Cerumen

A Cerumen Tunnel

Car Accident Victim Who just didn’t “feel right” afterward…

Another Foreign Object

Exostoses: Benign bony growths in the outer ear canal Contrast with Osteomas

exostosis

A False Tympanic Membrane A layer of dead skin cells builds up in persons who use earplugs or some hearing aids frequently

Injuries to Ear Canal

A Q-tip Victim

Squamous Cell Cancer

Malformations: congenital, traumatic or surgical. Microtia: external ear is small, malformed Atresia: ear canal is closed off. Post-cancer surgery.

Congenital Malformation

Microtia

Anotia: Pre- and Post-Op

Mastoiditis

Hearing Loss accompanying these disorders: Blockage or atresia: moderate flat conductive hearing losses. usually medically or surgically treatable. additional HL if congenital --associated problems w/ cochlea Surgical or traumatic: mid to high frequency conductive. prosthetics available, expensive.