Direct Visualization and Mapping of the Spatial Course of Fiber Tracts at Microscopic Resolution in the Human Hippocampus

Zeineh, Michael; Zilles, Karl; Axer, Markus; Gräβel, David; Wree, Andreas; Palomero-Gallagher, Nicola; Amunts, Katrin; Woods, Roger; Goubran, Maged

doi:10.1093/cercor/bhw010

Journal Article

FZJ-2017-03294

Direct Visualization and Mapping of the Spatial Course of Fiber Tracts at Microscopic Resolution in the Human Hippocampus

Zeineh, M. (Corresponding author) ; Palomero-Gallagher, N.FZJ* ; Axer, M.FZJ* ; Gräβel, D.FZJ* ; Goubran, M. ; Wree, A. ; Woods, R. ; Amunts, K.FZJ* ; Zilles, K.FZJ*

2017
Oxford Univ. Press Oxford

Cerebral cortex 27(3), 1779-1794 (2017) [10.1093/cercor/bhw010]

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Please use a persistent id in citations: doi:10.1093/cercor/bhw010

Abstract: While hippocampal connectivity is essential to normal memory function, our knowledge of human hippocampal circuitry is largely inferred from animal studies. Using polarized light microscopy at 1.3 µm resolution, we have directly visualized the 3D course of key medial temporal pathways in 3 ex vivo human hemispheres and 2 ex vivo vervet monkey hemispheres. The multiple components of the perforant path system were clearly identified: Superficial sheets of fibers emanating from the entorhinal cortex project to the presubiculum and parasubiculum, intermixed transverse and longitudinal angular bundle fibers perforate the subiculum and then project to the cornu ammonis (CA) fields and dentate molecular layer, and a significant alvear component runs from the angular bundle to the CA fields. From the hilus, mossy fibers localize to regions of high kainate receptor density, and the endfolial pathway, mostly investigated in humans, merges with the Schaffer collaterals. This work defines human hippocampal pathways underlying mnemonic function at an unprecedented resolution.

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