The superior colliculus is a paired structure that is found in the mammalian midbrain. It is a layered structure with the number of layers dependent on the species. Neurons found in the upper layers of the superior colliculus are highly responsive to visual signals received from the retina of the eye while the lower levels are sensitive to other communication or sensory modalities.
The general function of this system is to direct behavioral responses toward specific points in "body-centered" or egocentric (body-centered) space. Egocentric space, in this usage, refers to the distance in which a person or animal can physically effect their environment such as a person reaching out with their hands, or a snake striking a target. In this sense the supercolliculus is a part of hand-eye coordination.