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Caloric Test and Control of Horizontal Gaze

by Craig Canby, PhD
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    Welcome to this presentation on the vestibular system. The focus on this presentation is to inform you about a vestibular test, the caloric nystagmus test. I also want you to understand horizontal conjugate gaze, how that’s defined and the circuits that are involved in making sure the eyes do move together. It’s always very, very important to dive down into clinical considerations. So we’ll be able to explore three different clinical pathologies that are associated with the vestibular system. First is a test of the vestibular system. This is the caloric nystagmus test. This is considered a variant of the vestibulo-ocular reflex. This test involves, at the beginning, irrigation of an ear with cold water. For this slide, we’re going to irrigate the right ear with cold water. Then we’re going to see what happens to the movement of the eyes in response to this cold water irrigation. In response to irrigation of the right ear with cold water, the eyes will slowly move right as if the head is moving in the opposite direction to the left. The nystagmus component is the rapid eye movement. The rapid eye movement or nystagmus will occur then to the left. So we get slow movement of the eyes to the right and then there’s rapid eye movement back to the left. Again, this is what occurs in response to cold water irrigation of the right ear. Now, let’s do the same thing to the right ear but let’s irrigate with warm water. In response to irrigation of the right ear with warm water, the eyes will slowly move left as if the head is moving to the right. The nystagmus component, that rapid eye movement then will occur to the right, to the same side as the ear being irrigated with the...

    About the Lecture

    The lecture Caloric Test and Control of Horizontal Gaze by Craig Canby, PhD is from the course Auditory System and Vestibular System. It contains the following chapters:

    • Caloric Nystagmus
    • Control of Horizontal Gaze

    Included Quiz Questions

    1. Nystagmus to the right side
    2. Vertical nystagmus
    3. Conjugate vertical gaze palsy
    4. Nystagmus to the left side
    5. Eyes slowly move leftwards
    1. Eyes slowly move leftward initially
    2. Horizontal conjugate gaze palsy
    3. Vertical nystagmus occurs
    4. Nystagmus occurs to the left
    5. Eyes slowly move rightward initially
    1. Vestibular lesion
    2. Basal ganglia lesion
    3. Caudate nucleus lesion
    4. Hippocampal lesion
    5. Thalamic lesion
    1. …right lateral rectus and left medial rectus muscles.
    2. …right medial rectus and left lateral rectus muscles.
    3. …right inferior oblique and left superior oblique muscles.
    4. …right inferior rectus and left medial rectus muscles.
    5. …right lateral rectus and left superior rectus muscles.

    Author of lecture Caloric Test and Control of Horizontal Gaze

     Craig Canby, PhD

    Craig Canby, PhD


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