Clinical Study of Eleven Patients with Midbrain Infarction-Induced Oculomotor Nerve Palsy

In the 3 cases in which patients with vertical gaze palsy continued to exhibit Bell's phenomenon, it was considered that the palsy was caused by impairment of the rostral interstitial nucleus of the medial longitudinal fasciculus. Our study suggested that the intra-axial fascicular fibers innervating the medial rectus muscle are particularly susceptible to infarction, possibly because they are the most centrally located in the intra-axial oculomotor fascicular fibers.