Search records | 新潟大学附属図書館 OPAC

Abstract: We investigated some peptidergic pathways in the extrageniculate visual system, by employing immunohistochemical and neural tracing methods. Tectogeniculate pathway was revealed to include some peptidergic projections. There were … Substance P (SP)-, vasoactive intestinal polypeptide- and/or cholecystokinin-immunoreactive projections in this pathway. These peptidergic projections occurred in the superficial layers of the superior colliculus (SC) and ended in the lateral part of the dorsal lateral geniculate nucleus. In the superficial layers of the SC, immunoreactivity for SP receptor was found in the projection neurons while not was seen in the intrinsic neurons. This means outputs from the SC, which primarily could be driven by retinal inputs, are under control of SP. Though the source of SP has not been claified yet, SP neurons in the SC seem to be one source. In the pretectum, a special region where SP receptors were densely distributed was found. This region had few retinal inputs. SP receptor immunoreactive neurons in this region were revealed to have commissural projections, such as to the contralateral pretectum and SC. Read more

Abstract: Projections from the visual cortical areas to the striatum and superior colliculus are believed to play integral roles in visual attentive and orienting behaviors. In the cat, the direct corticotectal and indirect corticostriatal … (via the substanita nigra) projections of the lateral suprasylvian cortex (LS) are thought to converge on neurons situated in the deep laminae of the superior colliculus and exert their influences via the outputs of the superior colliculus (Norita et. '91). Read more

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