The Ultimate Vestibular System Quiz

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Questions and Answers

Which part of the inner ear is responsible for balance and spatial orientation?

  • Tympanic membrane
  • Utricle and saccule (correct)
  • Cochlea
  • Oval window

Which nerves connect to the vestibular nuclei?

  • Inf. vestibular n. and PSC (correct)
  • Optic nerves
  • Olfactory nerves
  • Trigeminal nerves

Which vestibular nucleus is also known as Deiters' nucleus?

  • Inferior vestibular nucleus
  • Lateral vestibular nucleus (correct)
  • Medial vestibular nucleus
  • Superior vestibular nucleus

What is the role of the vestibular system?

<p>Balance and spatial orientation (B)</p> Signup and view all the answers

What is the bandwidth of the semicircular canals?

<p>0.1-10 Hz (C)</p> Signup and view all the answers

Where are the primary vestibular neurons located?

<p>Spiral ganglion (C)</p> Signup and view all the answers

Which nerve is connected to the anterior semicircular canal and saccule?

<p>Upper vestibular nerve (B)</p> Signup and view all the answers

What is the function of the otolithic membrane and otoconia in the otolithic organs?

<p>Detect linear acceleration and head tilts (D)</p> Signup and view all the answers

What happens when stereocilia in hair cells move?

<p>They open ion channels for K+ to flow into the cell (C)</p> Signup and view all the answers

Which part of the saccule is connected to the IVN?

<p>Posterior 2/3 (C)</p> Signup and view all the answers

What is the effect of tilting the head to the left and linear acceleration to the left on firing rate in the otolith organs?

<p>Increase firing rate in the left otolith organ and decrease it in the right (B)</p> Signup and view all the answers

Flashcards

Balance and spatial orientation?

Utricle and saccule.

Nerves connected to vestibular nuclei?

Inferior vestibular nerve and posterior semicircular canal nerve.

Deiters' nucleus?

Lateral vestibular nucleus.

Role of the vestibular system?

Balance and spatial orientation.

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Bandwidth of semicircular canals?

0.1-10 Hz.

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Location of primary vestibular neurons?

Spiral ganglion.

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Nerve connected to anterior semicircular canal and saccule?

Upper vestibular nerve.

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Function of otolithic membrane and otoconia?

Detect linear acceleration and head tilts.

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Stereocilia movement effect?

They open ion channels for K+ to flow into the cell.

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Part of saccule connected to IVN?

Posterior 2/3.

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Head tilt/acceleration effect?

Increase firing rate in the left otolith organ and decrease it in the right.

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Study Notes

  • The text discusses the vestibular system and its nerves.
  • The inf. vestibular n. (IVN) connects to SSC, HSC, utricle, and the anterior 1/3 of the saccule.
  • The PSC and the posterior 2/3 of the saccule connect to the IVN.
  • There are four main vestibular nuclei: lateral (deiters), superior, med.
  • The vestibular system is responsible for balance and spatial orientation.
  • The utricle and saccule are part of the vestibule in the inner ear.
  • The IVN and PSC are nerves that connect to the vestibular nuclei.
  • The lateral vestibular nucleus is also known as Deiters' nucleus.
  • The superior and medial vestibular nuclei are part of the brainstem.
  • The vestibular system plays a role in eye movement and posture.
  1. The IVN receives signals from the PSC and saccular.
  2. Tilting the head to the left and linear acceleration to the left increase firing rate in the left otolith organ and decrease it in the right.
  3. Otolithic organs contain macules with otolithic membrane and otoconia.
  4. Stereocilia movement in hair cells opens ion channels for K+ to flow into the cell.
  5. The bandwidth of the semicircular canals is around 0.1-10 Hz.
  6. Primary vestibular neurons are unipolar and located in the spiral ganglion.
  7. The upper vestibular nerve is connected to the anterior semicircular canal and saccule.
  8. The inner ear receptors exhibit mirror symmetry and are paired in the same plane.
  9. The flow of endolymph in the lateral semicircular canal towards the utricle causes excitation.
  10. The flow of endolymph in the anterior semicircular canal towards the utricle causes excitation.

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