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Med Neuro2 Lect7

Med Neuro2 Lect7 Vestibular I

QuestionAnswer
What are the 5 receptor-organs in the vestibular apparatus? 1.Macula Saccule. 2.Macula Untricle. 3.Anterior semicircular canal. 4.Horizontal semicircular canal. 5.Posterior semicircular canal.
Defects in the vestibular system would cause what symptoms? 1.Dizziness. 2.Loss of balance. 3.Vertigo.
What fluid are the vestibular receptor-organs embedded in? Endolymph
Each semicircular canal terminates into a ________? Ampulla, then all 3 come together at the vestibule.
Describe the structure of the Macula sacula and Macula utricle Two rows of hair cells with striola b/w them that for 90 degree angles. **One of these two will be positioned to detect the pull of gravity at all times.
How does Endolymph enter the vestibular organ? where does it come from? The Saccule is connected to the base of the cochlea allowing endolymph to flow from the the scala media. **Produced by the Stria Vascularis.
What is located inside each Ampulla found at the end of each semicircular canal? What is located in them? Crista. **Vestibular nerve of CNVIII is located here for the depolarized hair cells to release vesicles onto.
When Vestibular hair cells are stimulated, what is actually moving to open up ion channels leading to their depolarization? Fluid bends the Cupula which extends across the ampulla and moves about the Crista of the Ampulla. **it is connected to sterocilia which are attached to the hair cell.
What is the large sterocilia connecting the hair cells on the Crista to the Cupula called? Kinocilium
Bending of the sterocilia towards or away from the Kinocilium will can a Ca+ influx into the hair cell? Bending TOWARDS the Kinocilium will Inc Ca+ influx. **Bending away from the Kinocilium will dec Ca+ influx.
What is the firing rate by the vestibular hair cells dependent on? Movement of the Cupula (thus sterocilia) towards or away from the Kinocilium. **Dischare rate is spontaneous.
What direction of fluid movement within the Anterior semicircular canal will cause sterocilia movement towards the Kinocilium? Into/towards the canal.
What direction of fluid movement within the Posterior semicircular canal will cause sterocilia movement towards the Kinocilium? Into/towards the canal.
What direction of fluid movement within the Horizontal semicircular canal will cause sterocilia movement towards the Kinocilium? Towards the utricle. **Away/out of the canal.
Are the stereocilia of the vestibular hair cells symmetrical or asymmetrical? ASYMMETRICAL. (large Kinocilium)
Compare the firing rate of the R and L vestibular hair cells in the horizontal semicircular canal when the head is neutral They will be the SAME
Compare the firing rate of the R and L vestibular hair cells in the horizontal semicircular canal when the head is turned to the left Firing rate is Inc on the L and Dec on the R. **Stereocilia will be bent towards L kinocilium, away from Kinocilium on the R.
Compare the firing rate of the R and L vestibular hair cells in the horizontal semicircular canal when the head is turned to the right? Firing rate is Inc on the R and Dec on the L. **Stereocilia are bending towards kinocilium on the R, away from the Kinocilium on the L.
Where do the signals from the vestibular organ travel from the hair cells? The vestibular nuclei transmits them back CN VIII which projects to the midline to the Median Longitudinal Fasciculus. **Runs the length of the brainstem & connects CN III, IV, & VI.
Created by: WeeG
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