csd 3103 anatomy of speech and hearing mechanisms hearing mechanisms fall 2008 l.
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CSD 3103 anatomy of speech and hearing mechanisms Hearing mechanisms Fall 2008. The Inner Ear. The major divisions of the inner ear. The vestibular system The cochlea The osseous or bony labyrinth The membranous labyrinth. Location of the inner ear within the skull.

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Presentation Transcript
the major divisions of the inner ear
The major divisions of the inner ear
  • The vestibular system
  • The cochlea
  • The osseous or bony labyrinth
  • The membranous labyrinth
the cochlea
The cochlea

Modiolus

Internal auditory meatus

Auditory nerve

Facial nerve

the cochlea9
The cochlea
  • Scala vestibuli
  • Scala tympani
  • Scala media
  • Helicotrema
  • Perilymph
the membranous labyrinth
The membranous labyrinth

The membranous labyrinth in relation to the bony labyrinth

the membranous labyrinth11
The membranous labyrinth

Endolymph

Semicircular canals

Utricle

Saccule

Scala media

the membranous labyrinth12
The membranous labyrinth

Ampullae

Crista ampularis

Ductus Reuiens

cross section of the cochlea
Cross section of the cochlea

Eighth Nerve

Vestibular branch

Acoustic branch

Base

Apex

Modiolus

Helicotrema

Scala Vestibuli, Tympani and Media

Basilar Membrane

Reissner’s Membrane

Spiral Lamina

cochlear partitions
Cochlear partitions

An “unrolled” cochlea, showing the relationships among the three scalae

path of vibration through the cochlea
Path of vibration through the cochlea

Vibrations are transmitted across scala media into scala tympani

mass action flow through the cochlea
Mass-action flow through the cochlea

Inward movement of the stapes footplate causes perilymph to flow up scala vestibuli, through the helicotrema, and down scala tympani, where the round window is distended

displacement of the basilar and tectorial membranes
Displacement of the basilar and tectorial membranes

The vertical displacement of the basilar and tectorial membranes produces a shearing force on the cilia of the hair cells

basilar membrane displacement
Basilar membrane displacement

Relative motion between the basilar and tectorial membranes places a shearing force on the stereocilia so they are bent away from the modiolus when the cochlear duct is displaced upward

movement of the basilar membrane
Movement of the basilar membrane

Schematic representation of the cochlea with the vestibule cut away. Arrows show the effects of a compressional sound wave produced by the stapes.

Example of the position of a portion of the basilar membrane in 3 successive instants during sinusoidal stimulation.

traveling wave
Traveling wave

Characteristics of the traveling wave generated by a 200 Hz stimulus peaking at a distance of about 29mm from the base of the cochlea

the traveling wave
The traveling wave

Schematic of amplitude patterns of traveling waves for sinusoids of various frequencies

organization of the cochlea
Organization of the cochlea

Tonotopic organization relates to the placement of auditory neurons in a particular structure (in this case, the cochlea) according to their responsiveness to specific frequencies