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Physiology II Exam 1 > Auditory Senses > Flashcards

Auditory Senses Flashcards

1
Q

The Auditory Cortes is located Where?

A

Temporal Lobe

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2
Q

Place Principle

A

Nervous system detects SOUND Freq by determining Positions along the Basilar membrane that are midst stimulated

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3
Q

Reissner’s Membrane

A
  • Separates the Scala Media from the Scala Vestibuli

- Maintains a special Fluid in the Scala MEDIA

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4
Q

What Cranial Nerve is for the Auditory system?

A

8

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5
Q

How much larger is the Tympanic membrane compared to the Stapes

A

17

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6
Q

What is the Voltage difference between the Endolymph and the Perilymph?

A

+80mV difference

  • Scala Media is POSITIVE
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7
Q

What kind of fibers make up the Auditory nerve?

A

Sensory Fibers

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8
Q

Organ of Corti

A

Generates Nerve Impulses in Response to Vibration of Basilar Membrane

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9
Q

Contents of Endolymph

A
  • High [K+]
  • Low [Na+]

OPPOSITE to the PERILYMPH

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10
Q

Endolymph vs Perilymph

A
  • Endolymph is inside the Scala MEDIA

- Perilymph is inside the Scala Tympani AND Scala Vestibuli

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11
Q

The major components of the Cochlea

A
  1. Scala
    - Vestibuli
  • Media
  • Tympani
    2. Reissner’s Membrane (Partition)
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12
Q

Reissner’s Membrane is also known as what?

A

Vestibular Membrane

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13
Q

Conduction Pathway Sequence

A
  • Tympanic Membrane
  • Auditory Ossicles
  • Oval Window
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14
Q

Auditory Transmission Pathway Components

A
  • Organ of Corti
  • Dorsal/Ventral Cochlear nuclei
  • Sup. Olivary Nucleus
  • Lateral Lemniscus’ Nucleus
  • Media geniculate Nucleus (Thalamus)
  • Auditory Cortex
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15
Q

What separates the Scala Media from the Scala Tympani?

A

Basilar Membrane

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16
Q

Muscles of the Middle ear

A
  • Tensor Tympani
  • Stapedius
  • Both Contract Reflexively in response to LOUD sound
    • > To dampen the vibrations
17
Q

Stapedius

A
  • Inserts on the Stapes

- Pulls Stapes OUTWARD

18
Q

Oval Window

A
  • Stapes attaches to the membrane covering the oval window

- Open into the Scala VESTIBULI (Tube)

19
Q

Tensor Tympani

A
  • Inserts on the Malleus

- Pulls handle of Malleus INWARD

20
Q

Round window

A

This membrane covered region is at the end of the SCALA Tympani

21
Q

What are the 3 Auditory Ossicles

A
  1. Malleus
  2. Incus
  3. Stapes
22
Q

What happens to the Basilar fibers as it moves from the Oval window to the Apex of the Cochlea

A
  • Length INCREASES
  • Diameter DECREASES

Go from Zu to Mason

23
Q

Impedance Matching

A
  • Tympanic membrane has 22x force than Cochlea

- Fluid had a greater INERTIA and requires the increase in force in order to cause Vibrations in the fluid

Physiology II Exam 1 (10 decks)

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