Chicken suprachiasmatic nuclei: I. Efferent and afferent connections

The Journal of Comparative Neurology
Elizabeth L Cantwell, V M Cassone

Abstract

The avian circadian system is composed of multiple inputs, oscillators, and outputs. Among its oscillators are the pineal gland, retinae, and a hypothalamic structure assumed to be homologous to the mammalian suprachiasmatic nucleus (SCN). Two structures have been suggested as this homolog -- the medial SCN (mSCN) and the visual SCN (vSCN). The present study employed biotin dextran amine (BDA) and cholera toxin B subunit (CTB) as anterograde and retrograde tracers to investigate the connectivity of the mSCN and vSCN in order to address this issue. Intravitreal injections of CTB were used to determine whether one or both of these structures receives afferent input from retinal ganglion cells. Both the vSCN and mSCN receive terminal retinal input, with the strongest input terminating in the vSCN. Precise iontophoretic injections of BDA and CTB in the mSCN and vSCN were used to identify efferents and afferents. The avian mSCN and vSCN collectively express more efferents and afferents than does the mammalian SCN. A subset of these connections matches the connections that have been established in rodent species. Individually, both the mSCN and vSCN are similar to the mammalian SCN in terms of their connections. Based on these data a...Continue Reading

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Citations

Oct 26, 2013·Frontiers in Neuroendocrinology·Vincent M Cassone
Jul 18, 2014·International Journal of Molecular Sciences·Bogdan LewczukBarbara Przybylska-Gornowicz
Jun 16, 2009·General and Comparative Endocrinology·Vincent M CassoneJennifer L Peters
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Sep 26, 2006·The Journal of Comparative Neurology·Elizabeth L Cantwell, Vincent M Cassone
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Feb 27, 2018·Frontiers in Neural Circuits·Tomas Vega-ZunigaHarald Luksch
Dec 18, 2013·Journal of Biological Rhythms·Aurore Woller, Didier Gonze

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