<prompt> Regarding involvement of structures in Weber syndrome all true except:Oculomotor nerve rootsCerebellar pedunclesCorticobulbar tractsCortispinal tract  <response>: Ref. API Textbook of Medicine. Pg. 533 Webers Syndrome constitutes an ipsilateral third nerve paralysis with a contralateral hemiplegia.It is due to a lesion in one half of the midbrain e.g. as a result of occlusion of the paramedian branches of the basilar artery.If there is a localised lesion in the region of the red nucleus, then there is paralysis of upward gaze. 