The vestibular system

First you tell them what your gonna tell them

The vestibular labyrinth answers two questions basic to the human condition

The vestibular labyrinth answers the  two questions basic to the human condition by sensing

The vestibular organ

The vestibular organ lies in the temporal bone

Each vestibular organ has a sensor for head acceleration, driven by hair cells similar to those in the cochlea

Deformation of the stereocilia towards the kinocilium causes hyperpolarization

Hair cells respond to deformation

How the semicircular canals sense rotation

The three semicircular canals lie in 3 orthogonal planes

The semicircular canals are functionally paired and sense rotation

The semicircular canals are functionally paired

The otolith organs sense linear acceleration. Hair cells lie in the macula.

Slide 15

The otolith organs sense linear acceleration

The signals in the vestibular nerve

There are 3 major vestibular reflexes

Connections to the vestibular nucleus from the canals

Nuclear Connections of the Otolith Organs

The lateral vestobulospinal tract

The Medial Vestibulospinal Tract (MVST)

The Horizontal Rotational
Vestibulo-ocular Reflex

The Horizontal Translational VOR

The VOR is plastic

The horizontal vestibulo-ocular reflex
(VOR)

Vestibular Nystagmus

The optokinetic signal

The vestibular nucleus combines
visual and vestibular signals

Visual-vestibular conflict

Vertigo and nystagmus

Other sequelae of peripheral vestibular dysfunction

Peripheral causes of vestibular dysfunction

Central causes of vertigo and nystagmus.

Cortical vestibular areas

Perceptual aspects of vestibular function