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However, a large number of patients continue to suffer lifelong disabilities without adequate treatment. In the present study, we have analyzed possible microanatomical alterations in the contralesional hippocampus from the ischemic stroke mouse model tMCAo 12\u201314\u2009weeks after transient middle cerebral artery occlusion. After individually injecting Lucifer yellow into pyramidal neurons from the CA1 field of the hippocampus, we performed a detailed three\u2010dimensional analysis of the neuronal complexity, dendritic spine density, and morphology. We found that, in both apical (\n                    <jats:italic>stratum radiatum<\/jats:italic>\n                    ) and basal (\n                    <jats:italic>stratum oriens<\/jats:italic>\n                    ) arbors, CA1 pyramidal neurons in the contralesional hippocampus of tMCAo mice have a significantly higher neuronal complexity, as well as reduced spine density and alterations in spine volume and spine length. Our results show that when the ipsilateral hippocampus is dramatically damaged, the contralesional hippocampus exhibits several statistically significant selective alterations. However, these alterations are not as significant as expected, which may help to explain the recovery of hippocampal function after stroke. Further anatomical and physiological studies are necessary to better understand the modifications in the \u201cintact\u201d contralesional lesioned brain regions, which are probably fundamental to recover functions after stroke.\n                  <\/jats:p>","DOI":"10.1111\/bpa.13222","type":"journal-article","created":{"date-parts":[[2023,11,27]],"date-time":"2023-11-27T21:51:04Z","timestamp":1701121864000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Structural changes of\n                    <scp>CA1<\/scp>\n                    pyramidal neurons after stroke in the contralesional hippocampus"],"prefix":"10.1111","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1842-9476","authenticated-orcid":false,"given":"Paula","family":"Merino\u2010Serrais","sequence":"first","affiliation":[{"name":"Laboratorio Cajal de Circuitos Corticales, Centro de Tecnolog\u00eda Biom\u00e9dica Universidad 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