The Mammalian Superior Colliculus: Studies of Its Morphology and Connections

Huerta, Michael F.; Harting, John K.

doi:10.1007/978-1-4899-5376-6_18

Cited by 440 publications

(230 citation statements)

References 356 publications

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“…This finding is understandable in light of the fundamental discovery that corollary discharge signals are sent from SC to FEF [23]. The SC projects to FEF both ipsilaterally [23,64] and contralaterally [65]. The same arrangement has been shown in projections from SC to LIP [31].…”

Section: Cortical and Subcortical Contributions To Remappingmentioning

confidence: 53%

Remapping for visual stability

Hall

Colby

2011

Phil. Trans. R. Soc. B

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Visual perception is based on both incoming sensory signals and information about ongoing actions. Recordings from single neurons have shown that corollary discharge signals can influence visual representations in parietal, frontal and extrastriate visual cortex, as well as the superior colliculus (SC). In each of these areas, visual representations are remapped in conjunction with eye movements. Remapping provides a mechanism for creating a stable, eye-centred map of salient locations. Temporal and spatial aspects of remapping are highly variable from cell to cell and area to area. Most neurons in the lateral intraparietal area remap stimulus traces, as do many neurons in closely allied areas such as the frontal eye fields the SC and extrastriate area V3A. Remapping is not purely a cortical phenomenon. Stimulus traces are remapped from one hemifield to the other even when direct cortico-cortical connections are removed. The neural circuitry that produces remapping is distinguished by significant plasticity, suggesting that updating of salient stimuli is fundamental for spatial stability and visuospatial behaviour. These findings provide new evidence that a unified and stable representation of visual space is constructed by redundant circuitry, comprising cortical and subcortical pathways, with a remarkable capacity for reorganization.

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Section: Cortical and Subcortical Contributions To Remappingmentioning

confidence: 53%

Remapping for visual stability

Hall

Colby

2011

Phil. Trans. R. Soc. B

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“…This information is a first step toward identifying the postsynaptic targets of these tectal inputs. However, the superficial layers of the SC contain a wide variety of cell types, including interneurons and cells that project to the parabigeminal nucleus, contralateral SC, pretectum, ventral and dorsal lateral geniculate nuclei, and lateral posterior nucleus (for reviews, see Huerta and Harting, 1984;May, 2006). SC interneurons, tectopretectal, and tectotectal neurons have been found to be GABAergic (Appell and Behan, 1990;Mize, 1992;Schmidt et al, 2001, Baldauf et al, 2003.…”

Section: Postsynaptic Targets Of Cortical Terminalsmentioning

confidence: 99%

“…The stratum griseum superficiale (SGS) and stratum opticum (SO) of the superior colliculus (SC) receive dense inputs from the retina and the visual cortex (for reviews, see Huerta and Harting, 1984;May, 2006) and these inputs interact with the SC circuitry to produce unique response characteristics. A particularly prominent feature of SGS/SO neurons is their sensitivity to stimulus movement.…”

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confidence: 99%

Comparison of the ultrastructure of cortical and retinal terminals in the rat superior colliculus

Boka

Chomsung

et al. 2006

Anat. Rec.

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We compared the ultrastructure and synaptic targets of terminals of cortical or retinal origin in the stratum griseum superficiale and stratum opticum of the rat superior colliculus. Following injections of biotinylated dextran amine into cortical area 17, corticotectal axons were labeled by anterograde transport. Corticotectal axons were of relatively small caliber with infrequent small varicosities. At the ultrastructural level, corticotectal terminals were observed to be small profiles (0.44 Ϯ 0.27 m 2 ) that contained densely packed round vesicles. In tissue stained for gamma amino butyric acid (GABA) using postembedding immunocytochemical techniques, corticotectal terminals were found to contact small (0.51 Ϯ 0.69 m 2 ) non-GABAergic dendrites and spines (93%) and a few small GABAergic dendrites (7%). In the same tissue, retinotectal terminals, identified by their distinctive pale mitochondria, were observed to be larger than corticotectal terminals (3.34 Ϯ 1.79 m 2 ). In comparison to corticotectal terminals, retinotectal terminals contacted larger (1.59 Ϯ 1.70 m 2 ) nonGABAergic dendrites and spines (73%) and a larger proportion of GABAergic profiles (27%) of relatively large size (2.17 Ϯ 1.49 m 2 ), most of which were vesicle-filled (71%). Our results suggest that cortical and retinal terminals target different dendritic compartments within the neuropil of the superficial layers of the superior colliculus. Anat Rec Part A, 288A: 850 -858, 2006.

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“…One of these areas, SCd, is known to be an important center of sensori-motor coordination and integration (e.g. Huerta and Harting 1984). Some neurons within the deep layers display uni-or multimodal sensory responses, whereas others are involved in the control of motor orientation of body, head or ears.…”

Section: Anatomical Substrates Of Vocal Controlmentioning

confidence: 99%

Neural control of vocalization in bats: mapping of brainstem areas with electrical microstimulation eliciting species-specific echolocation calls in the rufous horseshoe bat

Schuller

Radtke‐Schuller

1990

Exp Brain Res

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Summary. 1. The functional role of brainstem structures in the emission of echolocation calls was investigated in the rufous horseshoe bat, Rhinolophus rouxi, with electrical low-current microstimulation procedures. 2. Vocalizations without temporal and/or spectral distortions could be consistently elicited at low threshold currents (typically below 10 gA) within three clearly circumscribed brainstem areas, namely, the deep layers and ventral parts of the intermediate layers of the superior colliculus (SC), the deep mesencephalic nucleus (NMP) in the dorsal and lateral midbrain reticular formation and in a distinct area medial to the rostral parts of the dorsal nucleus of the lateral lemniscus. The mean latencics in the three vocal areas between the start of the electrical stimulus and the elicited vocalizations were 47 msec, 38 msec and 31 msec, respectively. 3. In pontine regions and the cuneiform nucleus adjacent to these three vocal areas, thresholds for eliciting vocalizations were also low, but the vocalizations showed temporal and/or spectral distortions and were often accompanied or followed by arousal of the animal. 4. Stimulus intensity systematically influenced vocalization parameters at only a few brain sites. In the caudo-ventral portions of the deep superior colliculus the sound pressure level of the vocalizations systematically increased with stimulus intensity. Bursts of multiple vocalizations were induced at locations ventral to the rostral parts of the cuneiform nucleus. No stimulus-intensity dependent frequency changes of the emitted vocalizations were observed. 5. The respiratory cycle was synchronized to the electrical stimuli in all regions where vocalizations could be elicited as well as in more ventrally and medially adjacent areas not yielding vocalizations on stimulation. 6. The possible functional involvement of the "vocal" structures in the audio-vocal feedback system of the Dopplercompensating horseshoe bat is discussed.

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The Mammalian Superior Colliculus: Studies of Its Morphology and Connections

Cited by 440 publications

References 356 publications

Remapping for visual stability

Remapping for visual stability

Comparison of the ultrastructure of cortical and retinal terminals in the rat superior colliculus

Neural control of vocalization in bats: mapping of brainstem areas with electrical microstimulation eliciting species-specific echolocation calls in the rufous horseshoe bat

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