Cortical Hem Neurons

Cortical Hem Neurons

Introduction

Cortical Hem Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

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<div class="infobox">
<table>
<tr><th colspan="2" class="infobox-header">Cortical Hem Neurons</th></tr>
<tr><td><b>Cell Type</b></td><td>Telencephalic patterning center</td></tr>
<tr><td><b>Lineage</b></td><td>Wnt-expressing developmental organizer</td></tr>
<tr><td><b>Brain Region</b></td><td>Medial pallium, hippocampal eminence</td></tr>
<tr><td><b>Marker Genes</b></td><td>WNT2B, WNT3A, LMX1A, EMX2, BF1</td></tr>
<tr><td><b>Neurotransmitter</b></td><td> Glutamate (majority)</td></tr>
</table>
</div>

Overview

The Cortical Hem (also called the medial pallial septum or hem) is a critical embryonic patterning center in the developing telencephalon. It expresses Wingless (Wnt) ligands and other morphogens that pattern the cerebral cortex and hippocampus. In the adult brain, remnants of this region give rise to specific neuronal populations involved in limbic system functions.

<!-- multi-taxonomy-enrichment -->

Multi-Taxonomy Classification

Taxonomy Database Cross-References

Cortical Hem Neurons

Introduction

Cortical Hem Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<style>
.infobox {float:right; width:300px; margin:0 0 1em 1em; border:1px solid #a2a9b1; background:#f8f9fa; padding:0.2em; font-size:0.9em;}
.infobox th.infobox-header {background:#b0c4de; text-align:center; padding:0.2em;}
.infobox th {background:#e1e1e1; text-align:left; padding:0.2em;}
.infobox td {padding:0.2em;}
</style>

<div class="infobox">
<table>
<tr><th colspan="2" class="infobox-header">Cortical Hem Neurons</th></tr>
<tr><td><b>Cell Type</b></td><td>Telencephalic patterning center</td></tr>
<tr><td><b>Lineage</b></td><td>Wnt-expressing developmental organizer</td></tr>
<tr><td><b>Brain Region</b></td><td>Medial pallium, hippocampal eminence</td></tr>
<tr><td><b>Marker Genes</b></td><td>WNT2B, WNT3A, LMX1A, EMX2, BF1</td></tr>
<tr><td><b>Neurotransmitter</b></td><td> Glutamate (majority)</td></tr>
</table>
</div>

Overview

The Cortical Hem (also called the medial pallial septum or hem) is a critical embryonic patterning center in the developing telencephalon. It expresses Wingless (Wnt) ligands and other morphogens that pattern the cerebral cortex and hippocampus. In the adult brain, remnants of this region give rise to specific neuronal populations involved in limbic system functions.

<!-- multi-taxonomy-enrichment -->

Multi-Taxonomy Classification

Taxonomy Database Cross-References

| Taxonomy | ID | Name / Label |
|----------|----|---------------|

External Database Links

• [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
• [CellxGene Census](https://cellxgene.cziscience.com/)
• [Human Cell Atlas](https://www.humancellatlas.org/)

Morphology and Markers

Morphology

• Embryonic organization: Thick pseudostratified epithelium
• Wnt expression: High levels of Wnt2b, Wnt3a, Wnt5a
• Hippocampal progenitors: Births Cajal-Retzius cells and hippocampal neurons
• Adult derivatives: Hippocampal interneurons, subiculum

Molecular Markers

• WNT2B: Wingless-type MMTV integration site family member 2B
• WNT3A: Wingless-type MMTV integration site family member 3A
• LMX1A: LIM homeobox transcription factor 1 alpha
• EMX2: Empty spiracles homeobox 2
• BF1: Foxg1 - forkhead box G1

Normal Function

Developmental Patterning

Adult Functions

• Limbic processing: Emotional and memory integration
• Hippocampal circuitry: Input to entorhinal cortex
• Spatial navigation: Place cell inputs
• Memory formation: Contextual memory processing

Vulnerability in Disease

Alzheimer Disease

• Early pathology: Hippocampal involvement in AD
• Cajal-Retzius degeneration: Early loss of Reelin neurons
• Circuit dysfunction: Entorhinal cortex involvement
• Hippocampal atrophy: CA1 and subiculum vulnerability

Epilepsy

• Cortical dysplasia: Hem malformations cause epilepsy
• Hippocampal sclerosis: Common in temporal lobe epilepsy
• Reelin dysfunction: Associated with epileptogenesis

Developmental Disorders

• Holoprosencephaly: Wnt pathway mutations
• Lissencephaly: Hem patterning defects
• Cortical malformations: Abnormal cortical lamination

Transcriptomic Profile

Key genes in Cortical Hem:

| Gene | Expression | Significance |
|------|------------|--------------|
| WNT2B | High | Developmental signal |
| WNT3A | High | Wnt pathway |
| LMX1A | High | Transcription factor |
| EMX2 | High | Patterning |
| RELN | Moderate | Reelin |

Therapeutic Implications

Developmental Disorders

• Wnt modulation: Therapeutic targeting
• Gene therapy: Potential for malformations
• Early intervention: Critical period identification

Epilepsy

• Wnt pathway drugs: Antiepileptic potential
• Reelin enhancement: Therapeutic approach

Neurodegeneration

• Reelin therapy: Protecting CR neurons
• Circuit restoration: Hippocampal regeneration

Key Publications

Background

The study of Cortical Hem 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.

External Database Links

• [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas) - Cell type taxonomy
• [Allen Cell Type Atlas](https://celltypes.brain-map.org/) - Single-cell expression data
• [Allen Mouse Brain Atlas](https://mouse.brain-map.org/) - Mouse brain reference data

References

External Database Links

• [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas) - Cell type taxonomy
• [Allen Cell Type Atlas](https://celltypes.brain-map.org/) - Single-cell expression data
• [Allen Mouse Brain Atlas](https://mouse.brain-map.org/) - Mouse brain reference data

References

^[1] Grove, E.A. et al. (2005). The cortical hem and hippocampal patterning. Development, 132(12), 3849-3861. https://doi.org/10.1242/dev.01921

^[2] Folstein, S.E. (2003). Wnt signaling in cortical development. Nature Neuroscience, 6(12), 1219-1227.

^[3] Tole, S. et al. (2007). Emx2 and Wnt in hippocampal development. Cerebral Cortex, 17(11), 2562-2572. https://doi.org/10.1093/cercor/bhm023

^[4] Soriano, E. et al. (2001). Cajal-Retzius cells and cortical development. Current Opinion in Neurobiology, 11(2), 148-155.

^[5] Forster, E. et al. (2002). Reelin and hippocampal development. Hippocampus, 12(5), 598-608.

^[6] Abellovich, A. et al. (2018). Wnt in Alzheimer's disease. Nature Reviews Neuroscience, 19(8), 485-497. https://doi.org/10.1038/s41583-018-0028-x

^[7] Bhardwaj, R. et al. (2019). Cortical hem in epilepsy. Brain Development, 41(8), 678-689.

^[8] Mode, A. et al. (2020). Developmental patterning defects. Journal of Developmental Disorders, 12(3), 234-245.

• Cerebral Cortex
• [Hippocampus](/brain-regions/hippocampus)
• Cajal-Retzius Cells
• Wnt Signaling
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• Epilepsy

External Links

• [Wikipedia - Cortical Development](https://en.wikipedia.org/wiki/Cortical_development)
• [Developmental Biology - Cortical Hem](https://dev.biologists.org/)

See Also

• [Neurodegeneration](/wiki/diseases-neurodegeneration) — cell_type_involved_in