The superior colliculus is part of the midbrain, also known as the tectum in non-mammalian vertebrates. This area of the brain directs behavioral responses, particularly how the eyes respond to stimulus and the corresponding movement of the head and neck.
If you are looking for this structure in a mammalian brain specimen, like a sheep, pull the cerebellum down and away from the cerebrum. The superior colliculus will appear as a “butt-shaped” structure between the two parts of the brain. The inferior colliculus lies directly below it. The round pineal gland can also be found tucked within the “butt-crack.”