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Hearing Science Chapter 3
Anatomy and Physiology of the Sensory Auditory Mechanism
39
Audiology
Undergraduate 3
09/04/2011

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Term
Labyrinth
Definition
Mazelike, interconnecting, fluid-filled canals that form the inner ear
Term
Membranous Labyrinth
Definition
Part of the labyrinth inside the bony labyrinth that is composed of soft tissue and consists of a series of comminicating sacs and ducts that conform to the shape of the larger bony labyrinth. Is is filled with endolymph.
Term
Bony (osseous) Labyrinth
Definition
Outer portion of the labyrinth that is filled with perilymph and surrounds the membranous labyrinth. It contains the cochlea, the three semicircular canals, and the vestibule.
Term
Perilymph
Definition
Fluid found in the osseous labyrinth of the inner ear.
Term
Cochlea
Definition
Section of the inner ear involving hearing; contains the organ of Corti, the sense organ for hearing.
Term
Semicircular Canals
Definition
Three canals, each of which represent a body plane in space and moves in conjunction with head and body activity; provide information to the brain about head position and movement.
Term
Vestibule
Definition
Central part of the labyrinth.
Term
Utricle
Definition
One of two communicating sacs found in the membranous labyrinth. Along with the saccule, it plays a role in maintaing spatial orientation.
Term
Saccule
Definition
One of two communicating sacs found in the membranous labyrinth. along with the Utricle, it plays a role in maintaining spacial orientation.
Term
Cochlear Duct
Definition
Middle of the three canals within the cochlea; contains the organ if Corti
Term
Endolymph
Definition
Fluid found in the membranous labyrinth
Term
Vestibular Portion
Definition
Section of the inner ear that is concerned with balance and spatial orientation.
Term
Scala Media
Definition
Middle of the three canals within the cochlea; contains the organ or Corti.
Term
Scala vestibuli
Definition
One of the three canals within the cochlea, separated from the Scala Media by Reissner's membrane.
Term
Scala Tympani
Definition
One of the three canals within the cochlea, separated from the scala media by the Basilar membrane.
Term
Reissner's Membrane
Definition
Tissue that separates the Scala vestibuli from the scala media
Term
Basilar Membrane
Definition
Tissue that separates the scala media from the scala tympani; holds the organ of Corti.
Term
Organ of Corti
Definition
Sensory end organ of hearing
Term
Stereocilia (cilia)
Definition
Small, hairlike projections on the tops of the inner and outer hair cells. Each outer haircell has as many as 150 stereocilia, and each inner haircell has 50 to 70 stereocilia. Displacement of the stereocilia results in depolarization of the neural charge.
Term
Cochlear Nerve
Definition
Branch of cranial nerve VIII that is formed as the hair cells of the organ of Corti synapse with nerve fibers. also called the auditory branch of cranial nerve VIII.
Term
Vestibular Nerve
Definition
Branch of cranial nerve VIII that originates from the vestibular portion of the inner ear and joins with the cochlear nerve.
Term
Statoacoustic Nerve
Definition
cranial nerve VIII, consisting of the suditory and vestibular branches; transmits information about hearing and balance
Term
Habenula Perforata
Definition
Tiny openings in the cochlea that allow neural fibers to pass to the organ of Corti.
Term
Stria Vascularis
Definition
Vascular complex that maintains the chemical compositioon of the endolymph in the cochlea
Term
Mass-stiffness Gradient
Definition
Difference in width and thickness (i.e., relative mass and stiffness) from the base to the apex of the basilar membrane. It results in variations in resonance at different locations of the basilar membrane.
Term
Traveling Wave
Definition
Complex pattern of vibration of the basilar membrane as pure-tome disturbances grow in magnitude from the base to the resonant point on the basilar membrane.
Term
Spiral Limbus
Definition
point of attachment for the tectorial membrane within the organ or Corti.
Term
Depolarization
Definition
Ionic exchange that alters the electrical potential of a hair cell, resulting in the release of a neurotransmitter.
Term
Otoacoutsic Emissions
Definition
Sounds produced by the cochlea. They may be evoked or spontaneous.
Term
Spontaneous Otoacoustic Emissions
Definition
Otoacoustic emissions that are produced without stimulation.
Term
Evoked Otoacoustic Emissions
Definition
Sounds produced by the cochlea in response to stimulation with clicks or carefully selected and arranged pure tones of very brief duration.
Term
Cochlear Microphonic
Definition
Alternating current (AC) potential in the cochlea that varies in exactly the same manner as stimulus and is only present while the stimulus is present.
Term
Summating Potential
Definition
Stimlus-related direct current (DC) response in the cochlea.
Term
Whole-nerve Action Potential
Definition
Response that originates in cranial nerve VIII. It is seen only at the onset of an abrupt signal and represents the synchronous discharge of many cranial nerve VIII fibers.
Term
Tuning Curve
Definition
Record of the responsiveness of a single hair cell to a variety of frequencies.
Term
Characteristic Frequency
Definition
Frequency at which the lowest level of stimulation results in an increase of firing rate.
Term
Sensory Mechanism
Definition
Functional component of the auditory system, consisting of the inner ear.
Term
Sensory Mechanism
Definition
Functional component of the auditory system, consisting of the inner ear.
Term
endocochlear potential
Definition
LArgest of two direct current (DC) potentials that can be measured in the cochlea, with no stimulation necessary, seen in the endolymph
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