Search results for "Lateral rectus muscle"
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Abduction saccades in unilateral internuclear ophthalmoplegia
1990
Horizontal eye movements were investigated in 60 consecutive patients with unilateral internuclear ophthalmoplegia utilizing direct current electrooculography. In nine patients additional conjugated slowing of ipsiversive saccades indicated the diagnosis of a one-and-a-half syndrome. Slowing of abduction saccades was bilateral in two patients and unilateral in 20 (ipsilateral to the MLF lesion in 17 patients and contralateral in three). Slowing of abduction saccades was attributed to impaired inhibition of the tonic resting activity of the antagonistic medial rectus muscle. On the eye contralateral to the lesion 70% of the patients had abduction nystagmus and 66.7% hy permetric abduction sa…
Slowed abduction saccades in bilateral internuclear ophthalmoplegia
1992
Horizontal eye movements were investigated in 65 patients with bilateral internuclear ophthalmoplegia utilizing direct current electro-oculography. Abduction saccades were slowed in 35 patients (53.8%), being hypermetric in 65.7% of them. Slowing of abduction saccades is attributed to impaired inhibition of the tonic resting activity of the antagonistic medial rectus muscle. Experimental data indicate that this slowing results from a lesion of an uncrossed connection between the pontine reticular formation and the oculomotor nucleus. The prevalence of hypermetric abduction saccades increased with increasing severity of adduction paresis on the opposite eye. This confirms the view that media…