internuclear ophthalmoplegia


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internuclear oph·thal·mo·ple·gi·a (INO),

ophthalmoplegia in lesions of the medial longitudinal fasciculus, with failure of adduction in horizontal gaze but with retention of convergence.
Farlex Partner Medical Dictionary © Farlex 2012

in·ter·nu·cle·ar oph·thal·mo·ple·gi·a

(INO) (in'tĕr-nū'klē-ăr of-thal'mō-plē'jē-ă)
Ophthalmoplegia in lesions of the medial longitudinal fasciculus, with failure of adduction in horizontal gaze but with retention of convergence.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

internuclear ophthalmoplegia

Abbreviation: INO
Loss of the normal paired movements of the eyes when tracking an object to the left or right. An INO is marked by the failure of one eye, e.g., the left, to cross the midline during an attempt to see an object on the opposite side of the body, e.g., the right.

Etiology

This failure of adduction of the affected eye is caused by a lesion of the medial longitudinal fasciculus of the brain.

Synonym: Roth-Bielschowsky syndrome
See also: ophthalmoplegia
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Clinical examination revealed features suggestive of left sided internuclear ophthalmoplegia i.e.
CNS tuberculoma can have varied clinical presentation ranging from mild headache, convulsions, hemiplegia, cranial nerve palsies and also rarely with panhypopituitarism (2), bilateral internuclear ophthalmoplegia (3), one and half syndrome (4) & eight and half syndrome.
As a further consequence, unilateral damage to the nucleus never causes isolated 6th nerve palsy, because loss of the internuclear pathway at source causes adduction weakness of the opposite MR (internuclear ophthalmoplegia).
Internuclear ophthalmoplegia (INO) - Horizontal gaze involves two cranial nerves, the abducens for the ipsilateral lateral rectus, and the oculomotor for the contralateral medial rectus.