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In the model due to Anastasio and Patton, deep SC neurons combine cortical input multiplicatively with primary input.

Various cortical regions project to the SC.

DLPFC projects directly to the SC.

There are projections from visual cortex to SC.

There are projections from auditory cortex to SC (from anterior ectosylvian gyrus).

There are projections from motor and premotor cortex to SC.

There are projections from primary somatosensory cortex to SC.

Posterior parietal cortex projects to the deep SC.

SEF projects directly to the SC, but different researchers disagree on the SC layers the projections terminate.

Visually active neurons in FEF do not project to SC. Motion-related neurons in FEF project to SC.

It seems unclear what is the original source of SC inhibition in preparation of anti-saccades. Munoz and Everling cite the supplementary eye fields (SEF), dorsolateral prefrontal cortex (DLPFC) as possible sources, and the substantia nigra pars reticulata (SNpr).

There seems to be an ascending pathway from superficial SC to the medial temporal area (MT) through the pulvinar nuclei (inferior pulvinar).

Lateral intraparietal area (LIP) projects to intermediate layers of SC.