jerk nystagmus

jerk nystagmus
jerky nystagmus nystagmus consisting of slow movement in one direction followed by a rapid return movement in the opposite direction; called also resilient or rhythmical n.

Medical dictionary. 2011.

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  • nystagmus — nystagmic, adj. /ni stag meuhs/, n. a congenital or acquired persistent, rapid, involuntary, and oscillatory movement of the eyeball, usually from side to side. [1815 25; < NL < Gk nystagmós nodding, deriv. of nystázein to nod] * * * ▪ physiology …   Universalium

  • central nystagmus — jerk nystagmus caused by a lesion somewhere in the neurologic pathways regulating gaze …   Medical dictionary

  • periodic alternating nystagmus — a rare type of jerk nystagmus that has rhythmic changes in amplitude and direction with intervals of quiet between periods …   Medical dictionary

  • resilient nystagmus — jerk n …   Medical dictionary

  • rhythmical nystagmus — jerk n …   Medical dictionary

  • mechanoreception — See mechanoreceptor. * * * Ability to detect and respond to mechanical stimuli in one s environment. A slight deformation of a mechanoreceptive neuron causes an electric charge at its surface, activating a response. Mechanoreceptors in pain spots …   Universalium

  • sensory reception, human — Introduction  means by which humans react to changes in external and internal environments.   Ancient philosophers called the human senses “the windows of the soul,” and Aristotle described at least five senses sight, hearing, smell, taste, and… …   Universalium

  • Reflex — A reaction that is involuntary. The corneal reflex is the blink that occurs with irritation of the eye. The nasal reflex is a sneeze. * * * 1. An involuntary reaction in response to a stimulus applied to the periphery and transmitted to the… …   Medical dictionary

  • Optokinetic reflex — Horizontal optokinetic nystagmus. The optokinetic reflex allows the eye to follow objects in motion when the head remains stationary (e.g. observing individual telephone poles on the side of the road as one travels by them in a car). The reflex… …   Wikipedia

  • Vestibulo-ocular reflex — The vestibulo ocular reflex. A rotation of the head is detected, which triggers an inhibitory signal to the extraocular muscles on one side and an excitatory signal to the muscles on the other side. The result is a compensatory movement of the… …   Wikipedia

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