GERARD MARSHALL Flashcards
What are the main structures of the outer ear
Pinna (auricle)
External Auditory Canal/Meatus
Eardrum –> Tympanic Membrane
What structures does the Pinna consist of
Helix Antihelix Lobule Tragus Antitragus Concha
Where is the EAM located
Temporal bone
The first 1/3 of the EAM consist of what and what is the function
The deeper 2/3 of the EAM consist of what
First 1/3 consist of hair, cartilaginous part
The deeper 2/3 has sparse hair –> osseous part
What type of glands are located in the EAM and what do they secrete and what is the function
Ceruminous glands that secrete cerumen and protein against dust and foreign objects
The cartilage of the auricle extends inwards to form the cartilaginous part of the ?
of the 1/3 of EAM
What gland lies antero-inferior to the EAM
Parotid gland
How long is the EAM in adults
2-3 cm in adults
The function of the EAM is 1- transfers what to the TM 2- assist in 3- provides \_\_ to sound and how many db 4- Protects the \_\_
EAM transfers sound waves to the TM
Assist in localization of sound
provides amplification to sound around 20 db
protects the TM
What shape does the EAM take in adult
S
In an adult, how do you pull the helix to help straighten the canal
pull helix back and up
The EAM is shorter or longer in children?
How do you straighten it
shorter
pull the helix down and back
The TM lies where to the EAM
medially
The TM forms the __ wall of the tympanic cavity
Lateral wall
TM moves in response to what __ passing from the EAM and then passes it to
Air vibrations
