The Neuroanatomical Organization of the Visual System in the Tree Shrew

Abplanalp, Paul

doi:10.1159/000155389

Cited by 25 publications

(1 citation statement)

References 11 publications

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“…However, the discovery of projections from the superior colliculus to the pulvinar nucleus of the thalamus and from this nucleus to extrastriate cortex [Abplanalp, 1970[Abplanalp, , 1971Diamond and Hall. 1969;Dia mond et al 1970] suggested that residual vision after loss of striate cortex was medi ated by a parallel visual pathway, the tecto-thalamo-cortical system.…”

Section: Introductionmentioning

confidence: 99%

Central Visual Field Representation in Striate-Peristriate Cortex as the Functional Unit of Pattern Discrimination in the Bushbaby (<i>Galago senegalensis)</i>

Caldwell

Ward

1982

Brain Behav Evol

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Bushbabies were trained on a battery of visual discrimination and localization tests and retested after serial lesions of the occipital and temporal lobes. The results of these experiments indicated that visual deficits following occipital lobectomy depend on the extent of damage to the central vision representation in both striate and peristriate cortices. If lesions involved both cortical representations of central vision, form and stripes discrimination capacities were lost. When the peristriate representation was spared, form vision was lost but vision for striped patterns was retained. The subsequent addition of middle or ventral temporal area lesions did not alter discrimination performance. Results are discussed in terms of a transcytoarchitectonic subdivision in striate and peristriate cortices as the functional unit of organization for pattern vision.

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Section: Introductionmentioning

confidence: 99%

Central Visual Field Representation in Striate-Peristriate Cortex as the Functional Unit of Pattern Discrimination in the Bushbaby (<i>Galago senegalensis)</i>

Caldwell

Ward

1982

Brain Behav Evol

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The ascending projections of the superior colliculus in the rhesus monkey (Macaca mulatta)

Benevento

Fallon

1975

J of Comparative Neurology

446

147

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We studied and compared the ipsilateral efferents of the superficial and deep layers of the superior colliculus of the rhesus monkey. Using a stereotaxic method, microelectrodes were inserted through the contralateral hemisphere in order to make electrolytic lesions of the superior colliculus. Large lesions involved all layers of the superior colliculus, while smaller lesions involved either the superficial or the deep layers of the superior colliculus. Following various survival times, the brains were prepared with the Fink-Heimer technique ('67). Following lesions of the superficial layers of the superior colliculus, definite degenerated axonal endings were found in the dorsal and ventral lateral geniculate nuclei, inferior pulvinar, centrointermediate nucleus, magnocellular dorsomedial nucleus, anterior pretectal nucleus and pretectal region. Sparse degenerated axonal endings were found in the limitans nucleus, lateral posterior nucleus and some intralaminar nuclei following lesions of the superficial layers in the rostral portion of the superior colliculus. Following lesions of the deep layers of the superior colliculus, degenerated axonal endings were found in the central gray, magnocellular medial geniculate nucleus, suprageniculate nucleus, limitans nucleus, lateral posterior nucleus, medial and oral pulvinar, nucleus of the accessory optic tract, zona incerta, subdivisions of the ventral lateral and ventral posterior lateral nuclei, ventral posterior inferior nucleus, denosocellular and multiform dorsomedial nuclei, all intralaminar nuclei, inferior colliculus, parabigeminal nucleus, olivary nucleus, reunions nucleus, Forel's Field H and an undefined midbrain nucleus. In general the projections were topographically organized in that the caudal portion of the superior colliculus projected to the rostral portions of thalamic nuclei and the rostral portion of the superior colliculus projected to the caudal portions of thalamic nuclei. All the degeneration patterns seen after lesions of the superficial and deep layers were accounted for by large lesions which involved all layers of the superior colliculus. It is concluded that the superficial and deep layers of the rehesus monkey superior colliculus have different ascending projections. The finding, are related to the organization of visual and multimodal thalamocortical systems in primates and other mammals.

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An autoradiographic study of the efferent connections of the superior colliculus in the cat

Graham

1977

J of Comparative Neurology

549

100

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The differential projections of the three main cellular s t r a t a of the superior colliculus have been examined in the cat by the autoradiographic method. The stratum griseum superficiale projects caudally to the parabigeminal nucleus and rostrally to several known visual centers: the nucleus of the optic tract and the olivary pretectal nucleus in the pretectum; t h e deepest C laminae of t h e dorsal lateral geniculate nucleus; the large-celled part of the ventral lateral geniculate nucleus; t h e posteromedial, large-celled part of t h e lateral posterior nucleus of t h e thalamus. Several of these projections a r e topographically organized.The stratum griseum profundum gives rise to most of the descending projections of t h e superior colliculus. Ipsilateral projections pass to both the dorsolateral and lateral divisions of t h e pontine nuclei, t h e cuneiform nucleus, and t h e raphe nuclei, and to extensive parts of the brainstem reticular formation: t h e tegmental reticular nucleus, and the paralemniscal, lateral, magnocellular, and gigantocellular tegmental fields. Contralateral projections descending in the predorsal bundle pass to t h e medial parts of the tegmental reticular nucleus and of some of the tegmental fields, t h e dorsal part of t h e medial accessory nucleus of t h e inferior olivary complex, and to t h e ventral horn of the cervical spinal cord. Ascending projections of the stratum griseum profundum terminate in several nuclei of t h e pretectum, the magnocellular nucleus of the medial geniculate complex and several intralaminar nuclei of the thalamus, and in t h e fields of Fore1 and zona incerta in the subthalamus.The s t r a t a grisea profundum and intermediale each have projections to homotopic areas of t h e contralateral superior colliculus, to the pretectum, and to t h e central lateral and suprageniculate nuclei of the thalamus. However, the stratum griseum intermediale has few or no descending projections.The superior colliculus of the cat has been the subject of intensive study, but there a r e certain aspects of its anatomical organization that remain unclear. Recent studies have provided evidence for a functional difference between t h e superficial and deep cellular laminae of the colliculus: the more superficial laminae respond solely to visual stimuli and seem to be involved in some types of visual discrimination; the deeper laminae respond not only to visual but also t o tactile and auditory stimuli and seem to be involved in mechanisms of attention to visual and other stimuli; some cells within the deeper laminae are active during most types of eye movements (Myers, '64; Sprague a n d Meikle, '65; Schaeffer, '70; Voneida, '70; J a n e et al. '75, '76; Raczkowski e t al., '76). The firing of some cells in the deep colliculus in relation to eye movements appears to reflect a n intimate interrelationship between the more superficial, visual, laminae and the underlying, multimodal, lam-' Supported hy Grants EY 0009'2 and X S 10626 from the Nutionul

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The Neuroanatomical Organization of the Visual System in the Tree Shrew

Cited by 25 publications

References 11 publications

Central Visual Field Representation in Striate-Peristriate Cortex as the Functional Unit of Pattern Discrimination in the Bushbaby (<i>Galago senegalensis)</i>

Central Visual Field Representation in Striate-Peristriate Cortex as the Functional Unit of Pattern Discrimination in the Bushbaby (<i>Galago senegalensis)</i>

The ascending projections of the superior colliculus in the rhesus monkey (Macaca mulatta)

An autoradiographic study of the efferent connections of the superior colliculus in the cat

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