What are vestibulotular reflexes?
The vestibular system, which consists of semicircular channels, construction and saccule inner ear, provides feedback on the position of the head in a short period of rapid head rotation, leading to rapid eye compensatory movements in the opposite direction to turning the head. For example, when a table in a swivel chair looks at a computer, it can maintain fixation on the computer, even if its body and head rotate in a chair with compensatory eye movements called vestibulotular reflexes. The information travels from the inner ear along the vestibular nerves to the vestibular cores in the brain stem, causing the excitement of the nerves that stimulate the movement of the eyes. These eye -compensatory movements prevent visual blur during head movement. Vestibulo-ocular reflex imbalances can cause rhythmic movements of eye eyes to A-Fro, called nystagmus, as well as dizziness, nausea and vomiting.
Vestibulotular reflex disturbances can stem from abnormalities in the inner ear or brain stem. Peripheral vestibular dysfUnkce associated with inner ear disease may be the result of infection, excessive fluid, trauma or toxicity for chemicals or medicines. Strokes, drugs or degenerative nerve diseases such as multiple sclerosis can cause central vestibular dysfunction by damage to the brain stem. Peripheral vestibular dysfunction characteristics include the serious nature of its symptoms, short -term duration and ringing in the ears associated with the condition. On the other hand, central disorders of vestibulotular reflexes have milder symptoms than peripheral dysfunction, but may be more chronic.
The lateral medular syndrome of Wallenberg is a well -known stroke syndrome that affects the brain strain and creates a vestibular imbalance. If damage due to poor blood flow to the side of the brainst, the sensory pathways are primarily affected and create a stroke that does not cause paralysis or muscle weakness. Patients with this syndrome complain about loss of feeling of pain or temperature on youJno side of the face as a lesion, along with the loss of pain and temperature on the opposite side of the body. They can also be difficult to speak, chronic hiccups, decreasing upper lid on the same side and difficulty swallowing. Eye tilt, feeling that the world is loading, and the feeling that it is attracted to one side is common symptoms that relate to the disruption of vestibulotular reflexes.
doctors can detect dysfunction of vestibulotular reflexes by allowing the patient horizontally head for fifteen seconds. Then, while holding a stable head, the doctor observes the position of the eye. Patients with imbalances in the vestibular system experience rapid eye jerk towards the damaged area of the wkompensation readings back to the straight position. In addition, patients with bilateral abnormalities in vestibulotular reflexes show a reduction in the field of vision, as tested on the eye chart when they read the graph and at the same time turn their heads back and forth. In patients with peripheral vestibular problems, fixation helps from distant thanAffective objects to calm the nausea and awareness of blurry vision, but patients with central problems do not experience their symptoms with fixation.