The Parasubiculum is a transitional cortical region located in the medial temporal lobe, positioned between the presubiculum and the entorhinal cortex[1][2]. This region serves as a critical hub in the medial temporal lobe memory system, integrating information from various cortical sources before it enters the hippocampal formation. The parasubiculum is particularly notable for its role in the head direction system and its involvement in spatial navigation and memory processes.
| Property | Value |
|---|---|
| Category | Transitional Cortex / Parahippocampal Region |
| Location | Dorsal medial temporal lobe, between presubiculum and entorhinal cortex |
| Cell Types | Pyramidal neurons, stellate cells, grid cells, head direction cells |
| Primary Neurotransmitters | Glutamate, GABA |
| Key Markers | Reelin, WFS1, CaMKII, Calbindin |
| Brodmann Area | Proisocortex |
The parasubiculum shares characteristics with both the presubiculum and entorhinal cortex[1:1]:
The parasubiculum contains grid cells that fire in spatially periodic patterns[2:1][3]:
Cortical Areas → Parasubiculum → Medial Entorhinal Cortex → Hippocampus
↓
Presubiculum → Head Direction Network
The parasubiculum is affected in neurodegenerative conditions[4][5]:
| Disease | Vulnerability | Pathological Mechanism |
|---|---|---|
| Alzheimer's Disease | High | Tau pathology, early neurofibrillary changes |
| Posterior Cortical Atrophy | Moderate | Visual-spatial network involvement |
| Lewy Body Disease | Low | Alpha-synuclein pathology |
The study of Parasubiculum 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.
van Strien NM, Cappaert NL, Witter MP. The anatomy of memory: an interactive overview of the parahippocampal-hippocampal network. Nat Rev Neurosci. 2009;10(4):272-282. https://pubmed.ncbi.nlm.nih.gov/19300446/ ↩︎ ↩︎
Moser MB, Moser EI. Functional differentiation in the hippocampus. Hippocampus. 1998;8(6):608-619. https://pubmed.ncbi.nlm.nih.gov/9882018/ ↩︎ ↩︎
Boccara CN, et al. Grid cells in pre- and parasubiculum. Nat Neurosci. 2010;13(8):987-994. https://pubmed.ncbi.nlm.nih.gov/20639874/ ↩︎
Braak H, Braak E. Neuropathological stageing of Alzheimer-related changes. Acta Neuropathol. 1991;82(4):239-259. https://pubmed.ncbi.nlm.nih.gov/1759558/ ↩︎
Pengas G, et al. The relationship between topographical memory and neurodegenerative diseases. Neuropsychologia. 2012;50(9):2153-2164. https://pubmed.ncbi.nlm.nih.gov/22634203/ ↩︎