CSD 212 Lecture Notes - Lecture 3: Eardrum, Antihelix, Earwax
3 Nov 2016
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Lecture 3: anatomy and physiology of the hearing mechanism. Pinna (the ear we see: made of skin over cartilage, consists of several parts no way! Helix - fold of skin at top of ear. Anti-helix - second fold of skin lol like a roman twin. Tragus - flap of ear you can fold over ear canal. External auditory meatus (ear canal: long (2. 5 cm) + narrow, leads to ear drum, ceruminous gland - produces earwax/cerumen. Laterally (outside of body) continuous w skin of ear canal. Medially (inside of body) continuous with mucosal lining. Canal around 2500 hz: aides in localization of sound. 3 tiny bones bridging outer and inner ears (ossicles: malleus (hammer) Point of attachment is umbro: incus - middle ossicle, stapes. Base of stapes (footplate) sits in the oval window and sends energy to inner ear: ossicular chain, disarticulation: when ossicles break.
