CH 2: Sound & the Ear Flashcards
What are the 3 parts of the ear and what energy is associated with each one?
Outer Ear –> Acoustic Energy
Middle Ear –> Mechanical
Inner Ear –> Fluid
3 parts of the Outer Ear?
Auricle (Pinna)
External Auditory Meatus (Ear Canal)
Tympanic membrane (ear drum)
Purpose of the Outer Ear?
collects & resonates (amps) sound; assisting in sound localization
protection for middle & inner ear
The middle Ear cavity is filled with ….
Air
ME: Malleus (aka ?) is connected to the …
hammer; most lateral bone of chain connected to the eardrum
me: Incus (aka ?) is the … bone of chain
anvil; center
ME: Stapes (??) … most bone; rocks in & out of … window
stirrup; medial most bone; oval window
The purpose of the Eustachian (?) tube is to .. (2 func)
auditory; 1 equalize pressure between ME cavity & nasopharynx
2: help drain fluid that may accumulate in ME
The two muscles in the ME are the … & …
stapedius; tensor tympani
The purpose of the ME is to match transfer energy between .. & …
Also protects…
air to fluid
also protects inner ear and amps signal freqs bewteen 100 & 2500 Hz
The IE consists of … & … labyrinths
auditory & vestibular
IE: Osseous Labyrinth is the _____ while the membranous lab is ________ & contains ___.
channel in bone
-soft tissue, fluid filled channel w/in oss lab containing end organs of hearing & balance
IE: Auditory Lab (?) is the sensory organ of ___
cochlea; hearing
IE: Vestibular Lab (??) is the sensory end of organ of ___
semicircular canal; balance
What 3 chambers are in the cochlea?
Scala Vestibuli (upper w perilymph), S media (middle w endolymph), S Tympani (lower w perilymph)
The cochela is w/in the __ lobe & is a ___ shape w several turns
temporal; snail
IE: What does the basilar membrane separate and where is it located?
on the floor of the S media & seps S tympani
IE: How are OHC different from IHC?
OHC: turned to sound intensity ~1300 (3 rows) embedded in tectorial membrane
IHC: turned to sound clarity; 1 row in same mebrane ~3500 total
The IE is responsible for..
cochelar wave mechanics, displace pattern of basilar membrane (mechanical change in HC length), CN VIII stimulation by IHC, infor coding
The vestibular system acts as a ____ _____
motion dectector
