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The superior colliculus does not receive any signals from short-wavelength cones (S-cones) in the retina.

It has been found that stimulating supposed motor neurons in the SC facilitates visual processing in the part of visual cortex whose receptive field is the same as that of the SC stimulated neurons.

Various cortical regions project to the SC.

DLPFC projects directly to the SC.

Many of the cortical areas projecting to the SC have been implicated with attention.

The superior colliculus is connected, directly or indirectly, to most parts of the brain.

The superficial SC projects retinotopically to LGN.

Superficial layers of the SC project to deep layers.

Both deep and superficial layers in left and right SC project to the corresponding layer in the contralateral SC.

There are excitatory and inhibitory connections from the deep to the superficial SC.

The excitatory and inhibitory connections from the deep to the superficial SC and the connection from the superficial SC to LGN may be one route through which deep SC activity may reach cortex.

There are inhibitory connections from deep SC to superficial SC (SGI to SGS).

The ventral lateral geniculate nucleus projects to the deep 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.

SC receives connections from cerebellum.

There's a loop from cerebellum to SC and back.

There are ascending pathways from SC to the eye fields through talamic structures.

There is a disynaptic connection from SC to the dorsal stream visual cortex, probably through the pulvinar.

It has been found that stimulating supposed motor neurons in the SC enhances responses of v4 neurons with the same receptive field as the SC neurons.

SC receives tactile localization-related inputs from the trigeminal nucleus.

ICx projects to intermediate and deep layers of SC.

Different types of retinal ganglion cells project to different lamina in the zebrafish optic tectum.

The lamina a retinal ganglion cell projects to in the zebrafish optic tectum does not change in the fish's early development. This is in contrast with other animals.

However, the position within the lamina does change.

The nucleus of the brachium of the inferior colliculus (nbic) projects to intermediate and deep layers of SC.

SC receives auditory localization-related inputs from the IC.

McHaffie et al. describe subcortical loops, and in particular loops involving the SC, through the basal ganglia.

McHaffie et al. speculate that loops through various subcortical loops might solve the selection problem, ie. the gating of competing inputs to shared resources.

In the SC, this means that the basal ganglia decide which of the brain structures involved in gaze shifts access to the eye motor circuitry.

There is a distinction between two different kinds of bats: megabats and microbats. Megabats differ in size (generally), but also in the organization of their visual system. In particular, their retinotectal projections are different: while all of the retinotectal projections in microbats are contralateral, retinotectal projections in megabats are divided such that projections from the nasal part of the retina go to the ipsilateral SC and those from the peripheral part go to the contralateral SC. This is similar to primate vision.

In primates, retinotectal projections to each SC are such that each visual hemifield is mapped to one (contralateral) SC. This is in contrast with retinotectal projections in most other vertebrates, where all projections from one retina project to the contralateral SC.

SC is connected to motor plants via brainstem.

There are ascending projections from the superficial SC to the Thalamus and from there to extrastriate cortex.

There are descending projections from the SC to the parabigeminal nucleus, or nucleus isthmii as it is called in non-mammals.

The deeper levels of SC are the targets of projections from cortex, auditory, somatosensory and motor systems in the brain.

The deeper layers of the SC project strongly to brainstem, spinal cord, especially to those regions involved in moving eyes, ears, head and limbs, and to sensory and motor areas of thalamus.

There are at least polysynaptic pathways from deep SC to cortex.

Polysynaptic pathways from deep SC to cortex may explain facilitation of visual processing in the V1 caused by SC

Hyde and Knudsen found that there is a point-to-point projection from OT to IC.

The deeper levels of SC receive virtually no primary visual input (in cats and ferrets).

The superior colliculus receives input from various sensory brain areas. According to King, these inputs are uni-sensory, as far as we know.

The auditory field of the anterior ectosylvian sulcus (fAES) has strong corticotectal projections (in cats).

Some cortical areas are involved in orienting towards auditory stimuli:

  • primary auditory cortex (A1)
  • posterior auditory field (PAF)
  • dorsal zone of auditory cortex (DZ)
  • auditory field of the anterior ectosylvian sulcus (fAES)

Only fAES has strong cortico-tectal projections.

Omnipause neurons in the reticular formation tonically inhibit `the saccade-generation circuit'.

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).

The supplementary eye fields (SEF) and dorsolateral prefrontal cortex (DLPFC) both project directly to the SC.

The superior colliculus sends motor commands to cerebellum and reticular formation in the brainstem.

The cerebellum sends motor commands to the reticular formation

It is the reticular formation that initiates saccades.

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

The retina projects to the superficial SC directly.

the frontal eye fields (fef) project to the SC and to the brainstem directly.

Substantia nigra pars reticulata (SNpr) tonically inhibits SC

Connectivity-wise, the strongest connections between SC and cortex are between SC and parietal lobe.

High white matter coherence between the parietal lobe and modality-specific brain regions is correlated with high temporal multi-sensory enhancement (shorter reaction times in multi-sensory trials than in uni-sensory trials).