part 2 Vestibular Proprioception 2012

part 2 Vestibular Proprioception 2012 - Understanding tonic...

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Understanding tonic activity is key to understanding signs of vestibular dysfunction!
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Vestibular Pathway: Upright Stance Left Right Head turns left on horizontal plane Left vest. app. Right vest. app. Activity in L app increases, activity in R app decreases Head still and centered Left vs. Right tonic activity equal
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Vestibular Pathway: Upright Stance Vestibulospinal tract Extensor mm Head turns left More extensor tone on left Less extensor tone on right More active L vest app stimulates L vestibulo- spinal tract Less active R vest app reduces activity in R vestibulo- spinal tract Why does horse need more extensor tone in left limbs when head turns left? To counteract leftward shift in center of gravity
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Left Right Head rotates left on long axis of neck Left vest. app. Right vest. app. Activity in L app increases, activity in R app decreases Head still and centered Left vs. Right tonic activity equal Vestibular Pathway: Level Head
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Cervical Epaxial Muscles Splenius Semispinalis Longissimus
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This note was uploaded on 01/31/2012 for the course BIOL 101 taught by Professor What during the Spring '11 term at TUFS.

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part 2 Vestibular Proprioception 2012 - Understanding tonic...

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