What are the oculomotor findings of basilar artery thrombosis?

Updated: Jan 11, 2019
  • Author: Salvador Cruz-Flores, MD, MPH, FAHA, FCCM, FAAN, FACP, FANA; Chief Editor: Helmi L Lutsep, MD  more...
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Oculomotor signs are common and can be associated with the syndromes described above. They usually reflect involvement of the vertical gaze center in the midbrain and/or the abducens nucleus, the horizontal gaze center located in the paramedian reticular formation contiguous to the abducens nucleus, and/or the medial longitudinal fasciculus. Lesions to these structures result in the following:

  • Ipsilateral abducens palsy

  • Ipsilateral conjugate gaze palsy

  • Internuclear ophthalmoplegia

  • One-and-a-half syndrome caused by a lesion simultaneously affecting the paramedian reticular formation and the medial longitudinal fasciculus, resulting in ipsilateral conjugate gaze palsy and internuclear ophthalmoplegia

  • Ocular bobbing, which localizes the lesion to the pons - This is characterized by a brisk, downward movement of the eyeball with a subsequent return to the primary position.

  • Skew deviation

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