Quick Reference
Afferentliivib: Cochlear division of the vestibulocochlear nerve.
Centra/I/itegratibn: Conscious perception of sound requires integration within the primary auditory cortex located in the Sylvian and Ectosylvian gyri of the temporal
lobe.
Effererirlimbz Orienting the ears and head toward the source of a loud sound is a reaction that utilizes the facial nerve and multiple somatic nerves.
Pathway Explanation
The auditory pathway is outlined as follows:
- Waves of differential air pressure are captured by the pinna and funneled down to the tympanic membrane, which separates the external earfrom the middle
ear.
- Vibratory motion of the tympanic membrane is amplified by the leverage of the auditory ossicles as it is transmitted across the air-filled middle ear to the
vestibular (oval) window of the inner ear.
- The perilymph within the osseous labyrinth receives the pressure waves transmitted by the vestibular window. These are carried into the cochlea by the scala
vestibuli.
- The dorsal viail of the cochlear duct (the vestibular membrane) resonates to the vibration frequency in the scala vestibuli and transfers that resonation across
the cochlear duct to the basilar membrane and underlying perilymph of the scala tympani.
- Movement of the basilar membrane results in movement of the hair cells in the overlying spiral organ [organ of Corti) vihich, in turn, produces bending of the
hair cells’ cilia against the more rigid tectorial membrane.
- It is the bending of the cilia that results in depolarization within the hair cells. This depolarization is the receptor potential which, when it reaches sufficient
intensity, initiates an action potential in the primary afferents of the spiral ganglion.
- The spiral ganglion I5 formed by the bipolar cell bodies of the cochlear nerve. It is found l|1 the bony core of the cochlea, known as the modiolus.
- From the spiral ganglion, the central processes of the afferent neurons gather to form the cochlear nerve. The cochlear nerve ]0il'lS with the vestibular nerve
as they exit the temporal bone at the internal acoustic meatus.
- The vestibulocochlear nerve enters the brainstem at the cerebellomedullary angle and terminates in dorsal and ventral cochlear nuclei on the lateral side of the
medulla.
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Quick Reference
Afferentliivib: Cochlear division of the vestibulocochlear nerve.
Centra/I/itegratibn: Conscious perception of sound requires integration within the primary auditory cortex located in the Sylvian and Ectosylvian gyri of the temporal
lobe.
Effererirlimbz Orienting the ears and head toward the source of a loud sound is a reaction that utilizes the facial nerve and multiple somatic nerves.
Pathway Explanation
The auditory pathway is outlined as follows:
- Waves of differential air pressure are captured by the pinna and funneled down to the tympanic membrane, which separates the external earfrom the middle
ear.
- Vibratory motion of the tympanic membrane is amplified by the leverage of the auditory ossicles as it is transmitted across the air-filled middle ear to the
vestibular (oval) window of the inner ear.
- The perilymph within the osseous labyrinth receives the pressure waves transmitted by the vestibular window. These are carried into the cochlea by the scala
vestibuli.
- The dorsal viail of the cochlear duct (the vestibular membrane) resonates to the vibration frequency in the scala vestibuli and transfers that resonation across
the cochlear duct to the basilar membrane and underlying perilymph of the scala tympani.
- Movement of the basilar membrane results in movement of the hair cells in the overlying spiral organ [organ of Corti) vihich, in turn, produces bending of the
hair cells’ cilia against the more rigid tectorial membrane.
- It is the bending of the cilia that results in depolarization within the hair cells. This depolarization is the receptor potential which, when it reaches sufficient
intensity, initiates an action potential in the primary afferents of the spiral ganglion.
- The spiral ganglion I5 formed by the bipolar cell bodies of the cochlear nerve. It is found l|1 the bony core of the cochlea, known as the modiolus.
- From the spiral ganglion, the central processes of the afferent neurons gather to form the cochlear nerve. The cochlear nerve ]0il'lS with the vestibular nerve
as they exit the temporal bone at the internal acoustic meatus.
- The vestibulocochlear nerve enters the brainstem at the cerebellomedullary angle and terminates in dorsal and ventral cochlear nuclei on the lateral side of the
medulla.
< PREV IZNEXT D
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