Information about how are we able to hear anything and process it through brain to manipulate whatever we are hearing.....

1. Mechanism
Of Hair Cell
Excitation

2. It is the receptor organ for hearing and is located in
the mammalian cochlea.

3. Structure of organ of
corti
• Receptor organ
• Single row of INTERNAL
HAIR CELLS
• 90-95% cochlear nerve
endings terminate on
inner hair cells
(detection of sound)
• 3 or 4 rows of OUTER
HAIR CELLS
transmit the auditory
signals to CNS
Control the sensitivity of inner hair
cells at different sound pitches called
as Tuning of the receptor system.

4. Reticular lamina
Stereocilia
Tectorial
membrane
Triangular rods
of
Corti
Basilar fibers

5. Single Hair Cell Structure
The hair cells of the organ of
Corti may have about 100
tiny stereocilia which in the
resting state are leaning on
each other in a conical
bundle.
In response to the pressure
variations in the Cochlea
produced by sound, the
stereocilia may dance about
wildly and send electrical
impulses to the brain.

8. At Rest Depolarization Hyperpolarization