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Efferent projections of the suprachiasmatic nucleus in the golden hamster (Mesocricetus auratus)
Outgoing neural pathways from the body clock area in golden hamsters
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Abstract
Major terminal fields of SCN-derived vasopressin were detected in the medial preoptic nucleus and several hypothalamic regions.
- Efferent projections from the suprachiasmatic nucleus (SCN) were identified using an anterograde tracer.
- Vasopressin-containing projections from the SCN were found in the medial preoptic nucleus, anterior paraventricular nucleus of the thalamus, and medial parvicellular part of the paraventricular nucleus of the hypothalamus.
- Vasoactive intestinal peptide projections were localized to the anterior and dorsal parvicellular divisions of the paraventricular nucleus and medial dorsomedial nucleus.
- Gastrin-releasing peptide-containing fibers were restricted to specific areas including the subparaventricular area and medial dorsomedial nucleus.
- Additional SCN projections were observed that did not correspond to the three investigated peptides, indicating potential other signaling pathways.
- Contralateral innervation of the SCN was noted, but the neurotransmitter involved remains unidentified.
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