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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 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.

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.

SC receives input and represents all sensory modalities used in phasic orienting: vision, audition, somesthesis (haptic), nociceptic, infrared, electoceptive, magnetic, and ecolocation.

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.

The lateral geniculate nucleus (lgn) is described as some sort of waystation.

The lateral geniculate nucleus (lgn) receives visual, auditory and higher cognitive input. According to Winston, 80% of lgn input is non-visual.

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.

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

The most important cortical input to the SC (in cats) comes from layer V cortical neurons from a number of sub-regions of the anterior ectosylvian sulcus (AES):

  • anterior ectosylvian visual area (AEV)
  • the auditory field of AES (FAES)
  • and the fourth somatosensory area (SIV)

These populations in themselves are uni-sensory.

There are monosynaptic excitatory AES-SC projections and McHaffie et al. state that "the predominant effect of AES on SC multisensory neurons is excitatory."

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

Different regions project to different lamina of the SC.

An SC output neuron which projects to some structure outside the SC may sample input from SC lamina according to the requirements of the target of its projections.

There are monosynaptic connections from the retina to neurons both in the superficial and deeper layers of the SC.

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.

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

Rowland et al. derive a model of cortico-collicular multi-sensory integration from findings concerning the influence of deactivation or ablesion of cortical regions anterior ectosylvian cortex (AES) and rostral lateral suprasylvian cortex.

Rowland et al. derive a model of cortico-collicular multi-sensory integration from findings concerning the influence of deactivation or ablesion of cortical regions anterior ectosylvian cortex (AES) and rostral lateral suprasylvian cortex.

It is a single-neuron model.

Pulvinar neurons project to the SC.

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

The retina projects to the superficial SC directly.

Substantia nigra pars reticulata (SNpr) tonically inhibits SC