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Review
. 2014 Feb;24(1):47-54.
doi: 10.1016/j.conb.2013.08.011. Epub 2013 Sep 17.

Cellular, Columnar and Modular Organization of Spatial Representations in Medial Entorhinal Cortex

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Review

Cellular, Columnar and Modular Organization of Spatial Representations in Medial Entorhinal Cortex

Andrea Burgalossi et al. Curr Opin Neurobiol. .

Abstract

Spatial discharge patterns in medial entorhinal cortex consist of grid, head direction, border and spatial-band cells. These firing patterns differ from the single-peaked fields of hippocampal place cells, in that they have well-defined geometries and extend throughout the available space. Such discharge properties could contribute to a metric representation of space. Both functional and anatomical evidence point to principal cell diversity, modularity and columnar organization, but linking entorhinal anatomy and physiology remains challenging. Layer 2 microcircuits consist of pyramidal neurons and a stellate cell network, which lacks recurrent excitation and is coupled by disynaptic inhibition. Intracellular recordings showed that periodic, grid-like firing emerges from depolarization ramps, whereas theta-oscillations determine spike timing. Interference with various inputs to entorhinal cortex abolishes grid activity, often without concomitant loss of hippocampal place activity.

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