The Amazing Ear
The range of audibility of the human 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 and 250
The average lenght of the adult ear canal is ___mm.
25 mm
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 degree angle
The lateral wall of the middle ear cavity is the _____.
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 or external orfice
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 cilia are found on the _____ 1/3 of the ear canal
Lateral
The outer layer of the eardrum is continuous with the skin of the _____.
Ear Canal
The tympanic _____ connect the middle ear 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.
ear canal
_____ protects the ear canal:lubricates the skin, protects against infection, and prevents the intrusion of onsects and other foreign bodies.
Cerumen
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