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Explain the mechanism through which a sound produces a nerve impulse in the inner ear.
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Neural Control and Coordination (Nervous System)
Explain the mechanism through which a sound...
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The
two sensory functions
that the ear performs are
hearing
and
maintaining the body balance.
Ear
is divided into
three parts
–
External ear, Middle ear and Internal ear.
The
external ear collects sound waves
and drives them towards the
tympanic membrane (ear drum).
The
ear drum vibrates
in response to the sound waves and these vibrations are transmitted to the
oval window
through the
ear ossicles
. (Malleus, Incus and Stapes)
From the
oval window
, these vibrations are passed on to the
fluid of the cochlea
, where they
generate waves
in the
lymphs.
The waves in these lymphs generate
ripples
in the
basilar membrane
.
Movements of the basilar membrane make the
“sensory hair”
of the receptor cells in the organ of corti move in the overlying
tectorial membrane
and
get distorted.
As a result of this stimulation,
nerve impulses
are generated
in the
associated afferent neurons
.
These impulses are transmitted to the
auditory cortex of the cerebrum
, via.
auditory nerves.
The auditory cerebral cortex
analyzes these impulses
and
interprets
them as
sound.
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