<prompt> Red nucleus is present atBase of ponsMidbrain, at level of superior colliculusMidbrain, at level of inferior colliculusMedial medulla  <response>: The red nucleus is diagnostic of midbrain division at the level of the superior colliculus; it lies between the occulomotor nucleus CN III and the substantia nigra. fig:- crossection at the level of Superior colliculus Midbrain 