Connectivity of the Superior Colliculus
(About the tectospinal tract) the tectospinales fibers originate in the superior colliculus, its axons pass ventromedially by the central gray matter and cross in the posterior tegmental decussation. The upper colliculus receives visual information, and the tectospinal tract is believed to act as a mediator of reflex eye movements in response to visual stimuli (Neuroanatomy of Crossman and Neary pg 81).

A relatively small number of fibers leave the optic tract, before reaching the dorsal nucleus of the lateral geniculate body, to terminate in the pretectal area and superior colliculus (fibers involved in pupillary reflex mediation) (Neuroanatomy of Crossman and Neary pg 157).