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Physiology 3120 Lecture Notes - Vestibular System, Vestibular Nerve, Vestibular Nuclei

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indigoweasel955
26 Nov 2011
School
Western University
Department
Physiology
Course
Physiology 3120
Professor
Tom Stavraky

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Document Summary

Vestibular system: adjacent to the cochlea, function is to position & orient the head in space, no conscious awareness of vestibular system in everyday life (compared to other sensory systems) Tuned by the cerebellum, which is adversely affected by alcohol. 2 vestibular system: semicircular system (3 in total at right angles to each other) Hair cells embedded in the cupula (gelatinous wedge) Responds to angular acceleration of the head in any direction; not head position, not. Hair cells can be of different orientations. Has crystals of calcium carbonate embedded in the gelatinous matrix on the hair cells; crystals provide inertia to the system. Detect to (i) linear acceleration, a dynamic stimulus, and (ii) gravity, a static stimulus: transduction of action potential in vestibular system. Large cilia = kinocilium; small cilia = stereo cilia. Record discharge to the viiith cranial nerve from hair afferents.

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Related Questions

This applet shows six disks rotating with constant angular acceleration. No two have the same initial angular velocity and angular acceleration. To answer the following questions, number the disks starting from the top. That is, call the yellow disk "1" and go sequentially down to the red disk, which will be "6". In the following questions, you will be asked to determine whether the disks' angular velocities and accelerations are positive, negative, or zero. Keep in mind that angular velocity is considered positive if rotation is in the counterclockwise direction. Angular acceleration is positive if the rotation is in the counterclockwise (positive) direction and the angular speed is increasing, or if rotation is the clockwise (negative) direction and the angular speed is decreasing (thus the angular velocity is becoming less negative). Negative angular acceleration is defined analogously.

http://session.masteringphysics.com/probhtml/ActivePhysics/pt1a/Media/RotMotionStatics/RotationalKinematics/Sim4.html

Part A

Which of the disks have positive initial angular velocity?

Write down the numbers, in order, that corresponds to the disk(s)

Part B

Which of the disks have negative initial angular velocity?

Write down the numbers, in order, that corresponds to the disk(s)

Part C

Which of the disks have zero angular acceleration?

Write down the numbers, in order, that corresponds to the disk(s)

Part D

Which of the disks have positive angular acceleration?

Write down the numbers, in order, that corresponds to the disk(s)

A potter's wheel rotates with an angular acceleration  where t is the time in seconds, a and b are constants, and α has units of radians per second squared. The initial position of the wheel is θ0  and the initial angular velocity is ω0. Obtain expressions for the angular velocity and the angular acceleration of the wheel as a function of time. 

The angular acceleration of a wheel is 

 

with  In radians per second-squared and t in seconds. At time t = 0, the wheel has an angular velocity of +2.0 rad/s and an angular position of +1.0 rad. Write expressions for the angular velocity (rad/s) as functions of time (s).