Inner Ear Flashcards

1
Q

Inner ear transduces ____ to _____

A

Mechanical energy to Bioelectric code

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2
Q

How is signal transduced?

A
  • Motion of stapes moves structures of IE

- This motion causes the hair cells to be stimulated at elicit neural discharges in auditory nerve

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3
Q

The inner ear provides 3 pieces of info about the sound:

A
  1. Frequency
  2. Intensity
  3. Temporal content
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4
Q

Three structures of the IE

A
  1. Semicircular canals
  2. Vestibule
  3. Cochlea
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5
Q

Semicircular canals

A

Represent X, Y, Z planes so your head knows what direction it’s in at all times
Tell you when you’re moving
Know; anterior canal, lateral/horizontal canal, and posterior canal

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6
Q

Vestibule

A

Between semi. canals and cochlea

Contains oval window

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7
Q

Cochlea

A

Winding organ w/ 2.75 turns
Decreases in diameter from base (biggest where stapes is)
35mm total length

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8
Q

Membranous labyrinths

A
  • located w/in bony labyrinths
  • chemical differentials allow for diffusion
  • contains endolymph (mostly K, less Na)
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9
Q

Bony labyrinths

A
  • contain perilymph (similar to CSF)

- Mostly Na, less K

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10
Q

Membranes connected to the cochlea are….

A

Oval Window and Round Window
Important for compression
When you push into the oval window, the round window bulges out, and vice versa

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11
Q

3 Tubes in the Cochlea

A
  • Scala media (middle tube)
  • Scala vestibule (top tube)
  • Scala tympani (bottom tube)
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12
Q

Reissner’s membrane

A
  • separates the scala media from scala vestibule
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13
Q

Basilar membrane

A
  • separates scala media from scala tympani
  • on bottom of scala media
  • auditory nerve formed off the ganglion
  • gets wider as you move from base to apex of cochlea (opp of cochlea!)
  • lower freqs resonate best at apex (floppy)
  • higher freqs resonate best at base (stiffer)
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14
Q

Organ of Corti

A

On BM

Contains OHCs and IHCs

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15
Q

Inner hair cells

A
  • 1 row of 3000
  • send signals TO brain
  • shaped like jugs
  • 50 sterecilia on top
  • tips of stereocilia NOT embedded in tectorial membrane
  • arranged in straight line
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16
Q

Outer hair cells

A
  • 3-5 rows of 12,000-15,000
  • take signals FROM brain
  • shaped like test tubes
  • 100 stereocilia on top
  • tips ARE embedded in tectorial membrane
  • arranged in U or W pattern (connected w/ tips)