3.AR-Vestibular syst Word Scramble
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| Term | Definition |
| Balance systems | Somatosensory, Visual, Vestibular |
| Somatosensory | Input from hips, legs, ankles, feet based on surface we are standing on. Major role in maintenance of balance. Transmits info you are conscious of: touch, pain, temperature. |
| Visual system | Visual input is compared and contrasted with other systems in perception of the world around us. Discrepancies can result in sensory conflict within the CNS (motion-sickness) and equilibrium probs. |
| Vestibular System | 1. semicircular canals and 2. vestibule |
| Semicircular canals | Fluid-filled. Changes of head position/planes of motion (angular acceleration). Linked to vis. system to maintain a stable visual image (vestibulo-ocular reflex). Cranial nerves, processing centers, eye muscles coordinate with inner ear structures. |
| Vestibule | One of the otolith organs (ampullae are the other) which respond to linear acceleration (elevator - up & down; car- forward & backward). |
| Vestibular-ocular reflex (VOR) | Eye movement that stabilizes and centers images on the fovea (area of retina) during head movement. |
| Nystagmus | VOR adjustments of the eye muscles. |
| Vestibular Testing | Audiologic, head rotation testing (Rotary Chair, Videonystagmography),balance testing (Computerized Dynamic Posturography - CDP) |
| Rotary Chair Test | rotational chair ✤ light-restricted booth ✤ head secured ✤ records eye movement (usually) ✤ eyes should move opposite to the direction and plane of head movement |
| Videonystagmography | infrared goggles capture eye movements ✤ recordings are computer analyzed ✤ evaluates inner ear structures, sensory and motor function of ocular muscles and brainstem processing ✤ caloric subtest irrigates each ear with cold/warm water. |
| Computerized Dynamic Posturography - CDP | ✤ Tests balance under various condition w/ pressure-sensitive footplate ✤ computer measures shifts in body weight and center of gravity. ✤ useful in documenting deficits in balance performance |
| VRT | Vestibular rehabilitation treatment |
| BPPV | Benign paroxysmal positional vertigo |
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