Vestibular Function Flashcards
what are the tasks associated with vestibular reflexes?
- maintain normal head position
- keep eyes focused on target
What reflex maintains normal head position? How?
Vestibulo-collic reflex (VCR)
controls neck muscles and posture
What reflex keeps eyes focused on target? How?
Vestibulo-ocular reflex (VOR)
controls ocular muscles
How many sensory organs are in the vestibular labyrinth?
5 sensory organs
What are the otolith organs? What are they for?
Saccule and Utricle
sensors for linear motion
What is the function of the semicircular canals?
sensors for rotational motion
Where are the sensory hair cells located in the saccule and utricle?
macula
Where are the sensory hair cells located in the SCC?
Crista
Where are the sensory hair cells located in the cochlea?
Organ of Corti
How is a depolarization caused with hair cells?
tilt toward the kinocilium
How is a hyperpolarization caused with hair cells?
tilt from the kinocilium
what is the function of the striola?
separates hair cells with opposite orientation
In what direction is the utricle the linear motion sensor for?
the XY plane
In what direction is the saccule the linear motion sensor for?
the Z direction
