Inner Ear

Question 1

Movement of the stereocilia of the IHC results in a flow of ____ ions into the stereocilia, that originate within the_____ fluid.

Answer 1

POTASSIUM, ENDOLYMPH

Question 2

OHC motility causes an increase in the intensity of sound at the cochlea, therefore OHCs act as a ________ _________

Answer 2

COCHLEAR AMPLIFIER

Question 3

If you’re in a an airplane that is taking off and the air pressure in the cabin drops, what happens to your eardrum?

Answer 3

POSITIVE PRESSURE, TM PUSHES OUTWARD

Question 4

Name the two main purposes of the inner ear system.

Answer 4

TRANSDUCE MECHANICAL TO ELECTROCHEMICAL, BALANCE SYSTEM

Question 5

Can you slice open the skill and take out the inner ear system as one piece? Why or why not?

Answer 5

NO. PETROUS PORTION OF TEMPORAL BONE IS A SPACE.

Question 6

What two major cranial nerves does the internal auditory canal carry?

Answer 6

ACOUSTIC AND FACIAL

Question 7

What membrane separates the scala vestibuli from the scala media?

Answer 7

REISSNER’S MEMBRANE

Question 8

Name the three fluids in the inner ear?

Answer 8

ENDOLYMPH, PERILYMPH, CORTILYMPH

Question 9

WHich fluid is high in Potassium (K+) and low in Sodium (Na+)?

Answer 9

ENDOLYMPH

Question 10

The spiral lamina is _____ at the base and ______ at the apex.

Answer 10

WIDE, NARROW

Question 11

Which type of hair cell in the cochlea is surrounded from the base to apex by supportive cells?

Answer 11

INNER HAIR CELLS

Question 12

This type of supportive cell forms the substance of the tectorial membrane:

Answer 12

BORDER CELLS OF HELD

Question 13

What are the two functions of the phalangeal process?

Answer 13

FORM RETICULAR LAMINAE, SUPPORT HAIR CELLS

Question 14

In the cochlea there are ____ rows of IHCs, and _____ rows of OHCs.

Answer 14

ONE, THREE

Question 15

The utricle and saccule are responsible for interpreting _____ acceleration.

Answer 15

LINEAR

Question 16

The bodys ability to maintain balance depends on information from three body systems. What are they?

Answer 16

VISUAL, SOMATOSENSORY, VESTIBULAR

Question 17

When the head turns right, the fluid in the horizontal semicircular canal lags behind the movement of the head due to:

Answer 17

INERTIA

Question 18

Narrow ducts projecting from the utricle and saccule join together to form the______

Answer 18

ENDOLYMPHATIC

Question 19

Tones of low frequency with longer wavelengths show maximum displacement of the basilar membrane near the _____ end of the cochlea.

Answer 19

APEX

Question 20

T or F: Low frequency sounds activate the high frequency end of the basilar membrane, in addition to their frequency specific points.

Answer 20

TRUE

Question 21

The OHC motility that results in the increase in the IHC response is called the______

Answer 21

COCHLEAER AMPLIFIER

Question 22

The responsiveness of auditory neurons to sounds at specific frequencies and not for sounds at other frequencies is called:______

Answer 22

FREQUENCY SELECTIVITY

Question 23

A collection of nerve fibers that enter the modiolus on their way to the IAC are called:___

Answer 23

SPIRAL GANGLIA

Question 24

The inner ear contains two labyrinth systems, what are they called?

Answer 24

OSSEOUS, MEMBRANOUS

Question 25

How many turns does the cochlea make from its base to its apex?

Answer 25

2 3/4

Question 26

The bony shelf that projects from the modiolus is called?

Answer 26

SPIRAL LAMINA

Question 27

What membrane separates the scala tympani from the scala media?

Answer 27

BASILAR MEMBRANE

Question 28

Where are the three fluids of the inner ear located?

Answer 28

ENDOLYMPH: INSIDE MEMBRANOUS LABYRINTH PERILYMPH: BETWEEN BONY AND MEMBRANOUS CORTILYMPH: INSIDE ORGAN OF CORTI

Question 29

T/F the fluids in the middle ear are compressible?

Answer 29

FALSE

Question 30

The basilar membrane is thinnest and stiffest where?

Answer 30

BASE

Question 31

The cochlea is the thickest and most flaccid where?

Answer 31

APEX

Question 32

If you slice a cochlea in half, it will have three channels. What are their names?

Answer 32

SCALA VESTIBULI SCALA MEDIA SCALA TYMPANI

Question 33

The stereocilia of the hair cells in the cochlea are attached to the hair cells at the?

Answer 33

CUTICULAR PLATE

Question 34

Each macula consists of a gelatinous membrane called?

Answer 34

OTOLITHIC MEMBRANE

Question 35

Outer hair cell motility improves our hearing sensitivity by about ( ) to ( )dB, and contributes to our ability to precisely distinguish among specific ( ).

Answer 35

40, 50, FREQUENCIES

Question 36

Each ampulla contain a sensory organ called the ______

Answer 36

CRISTA

Question 37

When coding the frequency of sound, both place and temporal coding mainly occur is between what frequencies.

Answer 37

1000-5000 HZ

Question 38

Each Crista consists of a gelatinous mass called the ___________.

Answer 38

CUPULA