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External
Middle
Inner
- External: auricle, external ear canal
- Middle: TM, auditory ossicles, eustachian tube
- Inner: labyrinth, cochlea, organ of Corti, CN VIII
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Collect and transmit sound waves
auricle and external ear canal
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divides external ear from middle ear, transmits sound waves
TM tympanic membrane
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Ossicles
three of the smallest bones in the body! They also transmit sound waves
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Eustachain Tube
equalizes pressure on both sides of TM
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Structures of inner ear transmit sound waves to
CN VIII and affect equilibrium
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Two salivary gland on both sides of frenulum
Wharton's ducts
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salivary ducts located opposite the upper second molars
Stensens Ducts
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Total Saliva produced/day
1000-1500ml
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32 teeth total
Incisors:
Canines:
Premolars:
Molars:
- Incisors: 4
- Canines: 2 "pointy"
- Premolars: 4
- Molars: 6
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Count/number teeth by..
- Counting: Top right-top left
- then bottom right-bottom left
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transmission of sound through the ear canal, TM and ossicular chain to cochlea and auditory nerve
Air conduction (Rhinne Test, next to ear)
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Bone conduction (Weber Test, on head)
transmission of sound through the BONES of the skull to the cochlea and auditory nerve
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Perichondrial Hematoma (common in wrestlers and boxers)
Cauliflower ear
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Perichondritis
Inflammation of the skin/tissue covering the cartilage of the ear
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Unpleasant odor of the breath
halitosis
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Furunculosis: painful, boil-like pustule in the EAC
is just an infection of a hair follicle. EAC edema and otorrhea may also be present
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