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Because HD is subjacent to HI, the two have been treated as one structure in many studies, and the fiber connections of HD have been examined by afferents and efferents originating outside HD. However, to clarify the difference between these two layers, they need to be treated separately. In the present study, the fiber connections of HD and HI were analyzed with tract\u2010tracing techniques using a combination of injections of cholera toxin subunit B (CTB) for retrograde tracing and biotinylated dextran amine (BDA) for anterograde tracing. When the two tracers were bilaterally injected in HD, a major reciprocal connection was seen with the dorsolateral subdivision (DL) of the hippocampal formation. When CTB and BDA were bilaterally injected in HI, strong reciprocal connections were found between HI and HA. Next, projection neurons in HD and HI were examined by double staining for CTB combined with <jats:italic>vesicular glutamate transporter 2<\/jats:italic> (<jats:italic>vGluT2<\/jats:italic>) mRNA in situ hybridization. After CTB was injected in DL or HA, many neurons revealed CTB+\/<jats:italic>vGluT2<\/jats:italic>+ in HD or HI, respectively. Furthermore, in situ hybridization showed that DL and HA contained neurons expressing various subunits of ionotropic glutamate receptors: AMPA, kainate, and NMDA types. These results suggest that glutamatergic neurons in HD and HI project primarily to DL and HA, respectively.<\/jats:p>","DOI":"10.1002\/cne.24328","type":"journal-article","created":{"date-parts":[[2017,9,11]],"date-time":"2017-09-11T01:26:39Z","timestamp":1505093199000},"page":"146-165","source":"Crossref","is-referenced-by-count":34,"title":["Differential projections of the densocellular and intermediate parts of the hyperpallium in the pigeon (<i>Columba livia<\/i>)"],"prefix":"10.1002","volume":"526","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8380-499X","authenticated-orcid":false,"given":"Yasuro","family":"Atoji","sequence":"first","affiliation":[{"name":"Laboratory of Veterinary Anatomy Faculty of Applied Biological Sciences, Gifu University Gifu Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sonjoy","family":"Sarkar","sequence":"additional","affiliation":[{"name":"Laboratory of Veterinary Anatomy Faculty of Applied Biological Sciences, Gifu University Gifu Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. 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