Cochlea

Question 1

What are the 3 chambers of the Cochlea?

Answer 1

1. Scala Vestibuli
2. Scala Media
3. Scala Tympani

Question 2

Which fluids are contained in each chamber of the Cochlea?

Answer 2

• Perilymph in Scala Vestibuli and Scala Tympani

- Endolymph in Scala Media

Question 3

INNER HAIR CELLS: # of rows, function & symptoms of damage

Answer 3

• 1 row
• mostly Afferent communication
• FUNCTION: hearing
• DAMAGE: sound distortion, incorrect identification of frequencies, misinterpretation

Question 4

OUTER HAIR CELLS: # of rows, function & symptoms of damage

Answer 4

• 3 rows, grows to 5 at apex
• Efferent communication (sends messages to IHC)
• FUNCTION: to move up and down (elongate or shrink) to sharpen the traveling wave, providing exact frequency discrimination, enable IHC to sense soft sounds
• DAMAGE: mild to moderate hearing loss up to 50-60 dB

Question 5

What are the symptoms of Cochlear Damage?

Answer 5

• Hearing loss
• Tinnitus: ringing/buzzing in ear
• Misperception of loudness

Question 6

ORGAN OF CORTI

Answer 6

Your drawing should include: Basilar Membrane, Tectoral Membrane, Scala Media, Inner hair cells, Outer hair cells, Cochlear Nerve, Cells

Question 7

How does the Cochlea have tonotopic arrangement?

Answer 7

Sounds of different frequency are processed separately.

Question 8

What information is coded at the basal and apical ends of the Cochlea?

Answer 8

Fibers are turned in different areas