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 1000 different ________ and 250 different ____________.
Pitches and 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 _______.
Isthmus
The eardrum forms a ____ degree angle with the floor of the ear canal in adults.
55
The lateral wall of the middle ear cavity is the _______.
Tympanic Membrane
The outer ear, the middle ear, the inner ear and the neural pathway make up the ____________.
Hearing Mechanism
The _____ is made of fibrous cartilage.
Auricle
The part of the ear canal largest in diameter is called the _______.
Auricular(or External Orifice)
The fibrocartilaginous ring around the edge of the eardrum is called the _______.
Annulus
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.
5-20dB
The peak ear canal resonance frequency occurs at about ____ Hz.
2700Hz
Hairs or _____ are found on the lateral ⅓ of the ear canal.
Cilia
The _______ layer of the eardrum is continuous with the skin of the ear canal.
Outer
The tympanic _____ connects the middle cavity to the mastoid air cells
Aditus
The ________ and ______ can be visualized using an otoscope.
ear canal and eardrum
The primary function of the ______ is to conduct sound to the eardrum.
Ear Canal
Cerumen protects the _______: lubricates the skin, protects against infection, and prevents the intrusion of insects and other foreign bodies.
Ear Canal
The middle fibrous layer of the eardrum is responsible for tympanic membrane ________.
Compliance
The ________ wall is a thin plate of bone that separates the tympanic cavity from the cranium.
Tegmental