Tectum of the midbrain that translates sensory input to movement output in the context of the environment, particularly with eye movements. There is one in each hemisphere of the brain that appears like a little bump on either side of the brainstem. In all mammals, the superior colliculus consists of seven layers. The superficial layers receive input from the retina and visual cortex, while the deep layers receive information from the auditory, visual, and somatosensory cortices. Stimulation of these deep layers have also been linked to movement, suggesting the motor functions of the superior colliculi.