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Título: | Cortical synapses of the world's smallest mammal: An FIB/SEM study in the Etruscan shrew |
Autor: | Alonso-Nanclares, Lidia CSIC ORCID CVN ; Rodrigo Rodríguez, J.; Merchán-Pérez, Ángel CSIC ORCID; González-Soriano, Juncal; Plaza-Alonso, Sergio CSIC ORCID; Cano-Astorga, Nicolás CSIC ORCID; Naumann, Robert K.; Brecht, Michael; DeFelipe, Javier CSIC ORCID | Palabras clave: | FIB-SEM brain cerebral cortex Electron microscopy synaptic junction ultrastructure. |
Fecha de publicación: | 2023 | Editor: | John Wiley & Sons | Citación: | Journal of Comparative Neurology 531: 390- 414 (2023) | Resumen: | The main aim of the present study was to determine if synapses from the exceptionally small brain of the Etruscan shrew show any peculiarities compared to the much larger human brain. We analyzed the cortical synaptic density and a variety of structural characteristics of 7,239 3D reconstructed synapses, using using Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM). We found that some of the general synaptic characteristics are remarkably similar to those found in the human cerebral cortex. However, the cortical volume of the human brain is about 50,000 times larger than the cortical volume of the Etruscan shrew, while the total number of cortical synapses in human is only 20,000 times the number of synapses in the shrew, and synaptic junctions are 35% smaller in the Etruscan shrew. Thus, the differences in the number and size of synapses cannot be attributed to a brain size scaling effect but rather to adaptations of synaptic circuits to particular functions. | Versión del editor: | http://dx.doi.org/10.1002/cne.25432 | URI: | http://hdl.handle.net/10261/343098 | Identificadores: | doi: 10.1002/cne.25432 issn: 1096-9861 |
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