Vestibular Component Research Articles

The tonic oculomotor function of the cervical joint and muscle receptors.

Cases of peripheral labyrinthine lesions were examined by stimulation of the cervical joint and muscle receptors. Head-chin (HC) position to one side induced compensatory oculomotor tone (ipsilateral nystagmus), which depended on the function of the horizontal canal of that side. This compensatory tone increased the duration of the optokinetic after-nystagmus (OKAN), with stripes moving contralaterally to the HC position. Isometric contraction of the muscles which rotate the HC to one side induced ipsilateral oculomotor tone (contralateral nystagmus), which depended on the function of the utricle acting in the same direction. In one case, the muscle-induced tone increased the frequency of the OKN with the slow phase in the same direction; in another, it prolonged the slow-phase pursuit interval. In the absence of a vestibular component, distortion of the OKN was induced.

Vestibular Syndrome and Vascular Anomaly in the Cerebello-Pontine Angle

During the investigation of patients presenting symptoms related to the Vth and VIIth nerves, frequently associated symptoms relevant to the VIIth nerve were found, such as tinnitus, disequilibrium or vertigo. On the other hand, there also came to our attention patients whose major complaints were of VIIIth origin, especially of the vestibular component, and who occasionally presented associated symptoms of Vth or VIIth nerve involvement. Following the successful treatment of trigeminal neuralgia and hemi-facial spasm by liberation of the Vth and the VIIth nerve from the mechanical irritative lesion, frequently a vascular loop anomaly, it was postulated that the same cause could be responsible of tinnitus and vertigo, secondary to irritation of the VIIIth nerve, in some cases. The clinical picture of VIIIth nerve involvement in the posterior fossa, either isolated or associated with facial pain or hemi-facial spasm, is presented together with the results of surgical treatment in 5 cases.

Vestibular component in dynamic muscle stretch.

ARTICLESVestibular component in dynamic muscle stretchDC HigginsDC HigginsPublished Online:01 Mar 1968https://doi.org/10.1152/ajplegacy.1968.214.3.482MoreSectionsPDF (2 MB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformation Cited ByVestibulo-Spinal MechanismsInteraction between voluntary contraction and tonic stretch reflex transmission in normal and spastic patientsJournal of Neurology, Neurosurgery & Psychiatry, Vol. 35, No. 6 More from this issue > Volume 214Issue 3March 1968Pages 482-487 Copyright & PermissionsCopyright © 1968 by American Physiological Societyhttps://doi.org/10.1152/ajplegacy.1968.214.3.482PubMed5638979History Published online 1 March 1968 Published in print 1 March 1968 Metrics

AN EXPLANATION OF THE MECHANISM OF INDUCED ROTARY AND VERTICAL NYSTAGMUS

A real explanation of induced rotary and vertical nystagmus should be definite as to the origins of the stimuli and the muscles stimulated. If such an explanation gives a consistent account of the phenomena, it may be accepted as dependable even though the exact neural connections are not yet demonstrated. In my proposed explanation, I shall start with the following assumption: Endolymph movement does occur, even though it consists in only a slight shift of the somewhat viscous fluid in the membranous semicircular canals; and such movement, bending the cupola and hair cells of the given crista toward or away from the canal, is the source of the stimulus to the eye muscle pairs which are known to contract in the slow or vestibular component of a nystagmus. The endolymph movement theory of the production of nystagmus induced by rotation or douching gives a satisfactory account of horizontal nystagmus. No