11 Questions
Which part of the inner ear is responsible for balance and spatial orientation?
Utricle and saccule
Which nerves connect to the vestibular nuclei?
Inf. vestibular n. and PSC
Which vestibular nucleus is also known as Deiters' nucleus?
Lateral vestibular nucleus
What is the role of the vestibular system?
Balance and spatial orientation
What is the bandwidth of the semicircular canals?
0.1-10 Hz
Where are the primary vestibular neurons located?
Spiral ganglion
Which nerve is connected to the anterior semicircular canal and saccule?
Upper vestibular nerve
What is the function of the otolithic membrane and otoconia in the otolithic organs?
Detect linear acceleration and head tilts
What happens when stereocilia in hair cells move?
They open ion channels for K+ to flow into the cell
Which part of the saccule is connected to the IVN?
Posterior 2/3
What is the effect of tilting the head to the left and linear acceleration to the left on firing rate in the otolith organs?
Increase firing rate in the left otolith organ and decrease it in the right
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.
- The IVN receives signals from the PSC and saccular.
- 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.
- Otolithic organs contain macules with otolithic membrane and otoconia.
- Stereocilia movement in hair cells opens ion channels for K+ to flow into the cell.
- The bandwidth of the semicircular canals is around 0.1-10 Hz.
- Primary vestibular neurons are unipolar and located in the spiral ganglion.
- The upper vestibular nerve is connected to the anterior semicircular canal and saccule.
- The inner ear receptors exhibit mirror symmetry and are paired in the same plane.
- The flow of endolymph in the lateral semicircular canal towards the utricle causes excitation.
- The flow of endolymph in the anterior semicircular canal towards the utricle causes excitation.
Test your knowledge of the vestibular system and its nerves with our quiz! Discover the four main vestibular nuclei and their functions, as well as the role of the utricle and saccule in balance and spatial orientation. Explore the IVN and PSC nerves and their connections to the vestibular nuclei. Learn about the otolithic organs, hair cells, and semicircular canals, and how they work together to detect head movement and maintain posture. Put your understanding to the test with
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