Comparative aspects of the olfactory portion of the entorhinal cortex and its projection to the hippocampus in rodents, nonhuman primates, and the human brain

Brain Research Bulletin
R InsaustiAlino Martinez-Marcos

Abstract

The entorhinal cortex is a component of the hippocampal formation characterized by its projection to the dentate gyrus. Cortical input is relayed to the hippocampus through the entorhinal cortex. The entorhinal cortex can be recognized best in mammals, and it reaches its maximal importance in both human and nonhuman primates. In primates, but not in rodents, the olfactory projection from the olfactory bulb is the only direct sensory projection reaching the entorhinal cortex, where it defines a rostromedial subfield (olfactory subfield of the entorhinal cortex, EO). In this communication, we consider some comparative aspects of this projection in rodents, nonhuman primates, and human brains, in relation to the forward projection to the hippocampus. We base our analysis on the following three considerations: (1) Topology: Topologically, the entorhinal cortex lies medial to the rhinal fissure, well developed in all mammals except in humans. EO maintains the same topological relationship to the rhinal fissure in the three mammalian orders. (2) Cytoarchitecture: The rostromedial portion shows poorer lamination compared with caudomedial portions of the entorhinal cortex in the three mammalian orders examined. (3) Connectivity: In rod...Continue Reading

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Citations

Jun 21, 2018·Frontiers in Behavioral Neuroscience·Mikhail A LebedevAlexei Ossadtchi
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Jun 5, 2020·Translational Neurodegeneration·Isabel Ubeda-BañonAlino Martinez-Marcos
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Oct 19, 2013·Brain Structure & Function·Isabel Ubeda-BañonAlino Martinez-Marcos
Apr 26, 2018·Frontiers in Systems Neuroscience·Mikhail A Lebedev, Alexei Ossadtchi
Jul 25, 2019·ELife·Guangyu ZhouChristina Zelano
Mar 9, 2019·Frontiers in Neuroanatomy·Ricardo InsaustiMónica Muñoz-López
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