<prompt> Internuclear opthalmoplegia is caused due to lesion in-Occipital lobespretectal fibresMedial longitudinal fasciculusparapontine reticular fibers  <response>: Ans. is c ie Medial longitudinal fasciculus Internuclear ophthalmoplegia is due to lesion of the medial longitudinal fasciculus MCFThis medial longitudinal fasciculus or bundle is the pathway by which various ocular motor nuclei are linked.The lesion in MLF leads to disruption of conjugate horizontal eye movements.There is ipsilateral loss of adduction on horizontal gaze, however the eye is able to adduct during convergence. 