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The \u201cWulst\u201d in the forebrain of night-migratory songbirds contains a brain area named \u201cCluster N\u201d, which is involved in processing directional navigational information derived from the Earth\u00b4s magnetic field. Cluster N is medially joined by the hippocampal formation, known to retrieve and utilise navigational information. To investigate the connectivity and neurochemical characteristics of Cluster N and the hippocampal formation of migratory birds, we performed morphological and histochemical analyses based on the expression of calbindin, calretinin, parvalbumin, glutamate receptor type 1 and early growth response protein-1 in the night-migratory Garden warbler (<jats:italic>Sylvia borin<\/jats:italic>) and mapped their mutual connections using neuronal tract tracing. The resulting expression patterns revealed regionally restricted neurochemical features, which mapped well onto the hippocampal and hyperpallial substructures known from other avian species. Magnetic field-induced neuronal activation covered caudal parts of the hyperpallium and the medially adjacent hippocampal dorsomedial\/dorsolateral subdivisions. Neuronal tract tracings revealed connections between Cluster N and the hippocampal formation with the vast majority originating from the densocellular hyperpallium, either directly or indirectly via the area corticoidea dorsolateralis. Our data indicate that the densocellular hyperpallium could represent a central relay for the transmission of magnetic compass information to the hippocampal formation where it might be integrated with other navigational cues in night-migratory songbirds.<\/jats:p>","DOI":"10.1007\/s00429-022-02566-y","type":"journal-article","created":{"date-parts":[[2022,9,17]],"date-time":"2022-09-17T09:03:35Z","timestamp":1663405415000},"page":"2731-2749","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Morphology, biochemistry and connectivity of Cluster N and the hippocampal formation in a migratory bird"],"prefix":"10.1007","volume":"227","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2831-6985","authenticated-orcid":false,"given":"Dominik","family":"Heyers","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7242-3123","authenticated-orcid":false,"given":"Isabelle","family":"Musielak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1365-2548","authenticated-orcid":false,"given":"Katrin","family":"Haase","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christina","family":"Herold","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Petra","family":"Bolte","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4173-5233","authenticated-orcid":false,"given":"Onur","family":"G\u00fcnt\u00fcrk\u00fcn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7082-4839","authenticated-orcid":false,"given":"Henrik","family":"Mouritsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,9,17]]},"reference":[{"issue":"3","key":"2566_CR2","doi-asserted-by":"publisher","first-page":"426","DOI":"10.1002\/cne.20186","volume":"475","author":"Y Atoji","year":"2004","unstructured":"Atoji Y, Wild JM (2004) Fiber connections of the hippocampal formation and septum and subdivisions of the hippocampal formation in the pigeon as revealed by tract tracing and kainic acid lesions. 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