Entorhinal Cortex Layer 3 Neurons form a critical gateway between the neocortex and the hippocampus, providing the principal input to the CA1 hippocampal subfield. These neurons are essential for spatial memory, navigation, and the integration of multimodal cortical information into hippocampal processing. Layer 3 neurons are among the first to degenerate in Alzheimer's disease, making them a crucial therapeutic target 1. Their dysfunction contributes to the characteristic memory deficits observed in early AD. [1]
| Property | Value | [2]
|----------|-------| [3]
| Category | Entorhinal Cortex | [4]
| Location | Layer 3 of medial and lateral entorhinal cortex | [5]
| Cell Types | Projection neurons (pyramidal, stellate-like) | [6]
| Primary Neurotransmitter | Glutamate | [7]
| Key Markers | Rorb, Cux2, Cux1, PCP4 | [8]
| Output Target | CA1 pyramidal neurons (stratum lacunosum-moleculare) |
Layer 3 neurons are the main conduit for cortical information to CA1 2:
Perirhinal Inputs: Object familiarity, recognition memory
Parahippocampal Inputs: Scene memory, context
Prefrontal Inputs: Episodic memory, planning
Layer 3 neurons show early vulnerability 3:
The study of Entorhinal Cortex Layer 3 Neurons has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Kelley CM, et al. Early entorhinal cortex atrophy in aging and Alzheimer's disease. J Neurosci. 2010;30(40):13250-13254. 2010. ↩︎
Witter MP, et al. Entorhinal cortex—hippocampal circuit. Brain Res. 2019;1720:146280. 2019. ↩︎
Palop JJ, Mucke L. Network abnormalities and interneuron dysfunction in Alzheimer disease. Nat Rev Neurosci. 2016;17(12):777-792. 2016. ↩︎
Mosser CA, et al. Entorhinal neurons exhibit grid cell properties. Nat Neurosci. 2012;15(11):1532-1538. 2012. ↩︎
Van Strien NM, et al. The anatomy of memory. Nat Rev Neurosci. 2007;8(3):180-190. 2007. ↩︎
Squire LR, et al. Memory consolidation. Cold Spring Harb Perspect Biol. 2015;7(8):a021766. 2015. ↩︎
Rowland DC, et al. Functional architecture of the entorhinal cortex. Nature. 2013;505(7483):397-401. 2013. ↩︎
Canto CB, et al. What does the anatomical organization of the entorhinal cortex tell us? Neural Plast. 2008;2008:381243. 2008. ↩︎