What Are Vestibulo-Ocular Reflexes?

Vestibular-eye reflex is the stimulation of both the semicircular canal and the otolith to cause eye movement through the vestibular ocular bundle. At present, many vestibular function tests in clinic are based on vestibular-eye reflex, such as otolith examination, hot and cold test, swivel chair test, head shake test, etc.

Eye vestibular reflex

Right!

Vestibular-eye reflex is the stimulation of both the semicircular canal and the otolith to cause eye movement through the vestibular ocular bundle. At present, many vestibular function tests in clinic are based on vestibular-eye reflex, such as otolith examination, hot and cold test, swivel chair test, head shake test, etc.

The vestibulo-ocular reflex sensor is the semicircular canal, as well as the ampulla and the proprioceptor of the neck. The afferent impulse is relayed to the vestibular nucleus, and then the medial longitudinal bundle is used to activate the oculomotor and abductor nucleus. Examination methods used clinically for bilateral eye movements include: (1) head-eye reflex, also known as doll eye reflex. (2) Cold / hot water excitation test. For coma patients, the ice water challenge test is generally used. The patient was in a supine position with his head raised 30 ° and deviated to the opposite side. The examiner injected 2 ml of ice water into the ear canal with a syringe and observed for several minutes. Patients with complete brainstem function slowly turned their eyes to the same side of the injection, and a horizontal nystagmus with rapid eye movement facing the opposite side occurred at the same time ^[1]