SOUND PERCEPTION -- The Organ of Corti--The Hearing Organ

Question 1

Vibrates in respond to sound waves.

Answer 1

Basilar membrane

Question 2

Made of epithelium, collagen and

elastic fibers.

Answer 2

Basilar membrane-

Question 3

Neurons found in basilar membrane; Have special sensory microvilli (stereocilia) sticking out of their tops; Bending of microvilli produces action potentials that the
temporal lobe of cerebrum interprets as sounds (Inner Hair Cells).

Answer 3

Hair cells

Question 4

Produce the APs that the cerebrum interprets/turns into sounds.

Answer 4

Inner Hair Cells

Question 5

Form the Cochlear Amplifier which “tunes” the inner hair cells or allows them to precisely distinguish between different sound pitches.

Answer 5

Outer Hair Cells

Question 6

What are the 2 types of hair cells and how many rows of hair are in each?

Answer 6

Inner Hair Cells—1 Row

Outer Hair Cells—3 Rows

Question 7

—Stiff, gel-like roof that the stereocilia of hair cells are embedded in

Answer 7

Tectorial membrane

Question 8

Made of neurons that synapse with the inner hair cells; Carries APs to areas of brainstem for processing and eventually to auditory cortex of temporal lobe.

Answer 8

Cochlear nerve

Question 9

Ototoxic drugs damage which hair cells causing hearing loss.

Answer 9

Outer Hair Cells