Vestibular System
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What are the parts to the peripheral vestibular system?
• Superior/anterior canals • Middle/horizontal canals • Posterior Canals • Utricle • Saccule
What structures make up the inner ear?
Cochlea, vestibule, semicircular canals
What are the names of the vestibular nuclei?
superior, inferior, lateral, and medial
What are the functions of the vestibular system?
motion detection generating compensatory movement needs to maintain the stability of the body, head, and eyes in space
The horizontal canal is pitched ___ degrees above true horizontal. What is this called?
30 Reed’s line
The semicircular canals are at ___ degrees angles to one another.
90
The cochlear apparatus is at a ___ degree angle to midline.
45
What motion is pitch?
“yes” Cervical flexion
What motion is yaw?
“no” cervical rotation L and R
What motion is roll?
cervical extension and rotation
Where is perilymph fluid located?
between boney and membranous labyrinth
Where is endolymph fluid located?
Within membranous labyrinth
____ are hair cells that detect motion via movement of ____.
stereocilia endolymph
Large hair like projection that detects motion
Kinocilium
What factor (excitation/inhibition) is detected when steriocilium bend toward kinocilium?
excitation
What factor (excitation/inhibition) is detected when stereocilium bend away from kinocilium?
inhibition
Name the pairs of canals that maximize fluid flow?
horizontal Left anterior, Right posterior R anterior, L posterior
If you turn your head to the L, you will maximally excite which canal? What is this called?
L horizontal Yaw
If you turn head to R and pitch, what are you exciting?
L anterior canal
If you turn head to the R and roll, what are you exciting?
R posterior canal
During acceleration, endolymph flows in the same or opposite direction of head movement?
opposite
During deceleration prior to stopping, endolymph flows in the same or opposite direction of head movement?
same
True or False. Otoliths are sensitive to rotation.
False
What structures are otoliths?
saccule and utricle