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Chapter-09 Neuro-ophthalmic Manifestation of Abducens (Abducent) Lesions

BOOK TITLE: Essentials of Neuro-ophthalmology

Author
1. Mukherjee PK
ISBN
9788184489828
DOI
10.5005/jp/books/11188_9
Edition
1/e
Publishing Year
2010
Pages
12
Author Affiliations
1. Pandit Jawaharlal Nehru Memorial Medical College, Raipur, Chhattisgarh, India, Pt JNM Medical College, Raipur, Chhattisgarh, India, Pandit Jawahar Lal Nehru Memorial Medical College, Raipur, Chhattisgarh, India, Pt Jawahar Lal Nehru Memorial Medical College, Raipur, Chhattisgarh, India
Chapter keywords

Abstract

Sixth nerve dysfunction is the commonest and most obvious cause of paralytic squint that is most difficult to diagnose. It has a long intracranial course next only to the fourth nerve. In contrast to the third and fourth nerves, the sixth nerve does not decussate anywhere in its course. The fourth nerve decussates completely in the anterior medullary velum. The third nerve decussates partially in the midbrain. It passes through the pyramidal tract. The sixth nerve nucleus sub serves ipsilateral lateral rectus in contrast to fourth nerve where the right fascicles proceed to become left trochlear nerve trunk to supply contralateral superior oblique. There are no aberrant regeneration of sixth nerve in contrast to the third nerve. There are many condition that masquerade as abducens palsy without being so. They may collectively be referred as pseudo abducens palsy. Sixth nerve may be involved at any age between newborn to ripe old age. It may be associated with oculosympathetic path.

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