"The Amazing Ear"
The range of audibility of the human ear is about _____ Hz to ______ Hz.
20Hz to 20,000Hz
The auricle is also called the ______.
pinna
The _________ is the cartilaginous flap partially occluding the opening to the ear canal.
tragus
Another name for the eardrum is _________.
tympanic membrane
The _________ is formed by the lateral projection of the basal turn of the cochlea.
promontory
The untrained ear can detect at least _______ different pitches and _________ different intensity levels.
1000 different pitches and 250 different intensity levels
The average length of the adult ear canal is ______mm.
25mm
The juncture of the bony and cartilaginous parts of the ear canal is called the _______.
The eardrum forms a ____ degree angle with the floor of the ear canal in adults.
55 degree
The lateral wall of the middle ear cavity is the _______.
tympanic membrane
The hearing mechanism consists of the outer ear, the _____, the ______, and the neural pathway.
middle ear and inner ear
The auricle is made of __________.
fibrous cartilage
The part of the ear canal largest in diameter is called the _______
auricular/external orifice
The fibrocartilaginous ring around the edge of the eardrum is called the _______.
fibrocartilaginous
The epitympanic recess lies medially and extends _________ relative to the tympanic membrane
superiorly
There is a _______ dB increase in sound pressure at the eardrum due to resonance effects of the ear canal and head effects.
5-20 dB
The peak ear canal resonance frequency occurs at about ____ Hz.
2700 Hz
Hairs or cilia are found on the ____ ⅓ of the ear canal.
lateral
The _______ layer of the eardrum is continuous with the skin of the ear canal.
outer layer
The tympanic _____ connects the middle cavity to the mastoid air cells
aditus
The ear canal and eardrum can be visualized using an _______.
otoscope
The primary function of the ______ is to conduct sound to the eardrum.
_______ protects the ear canal: lubricates the skin, protects against infection, and prevents the intrusion of insects and other foreign bodies.
cerumen/ear wax
The middle ______ layer of the eardrum is responsible for tympanic membrane compliance.
fibrous
The ________ wall is a thin plate of bone that separates the tympanic cavity from the cranium.
tegmental