Basal Nucleus of Meynert (Expanded)

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Basal Nucleus of Meynert (Expanded)

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Basal Nucleus of Meynert (Expanded)</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000646](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000646)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000646](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000646)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:2000056](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000056)</td>
</tr>
</table>

Introduction

Basal Nucleus Of Meynert (Expanded) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

...

Basal Nucleus of Meynert (Expanded)

Introduction

Overview

The Basal Nucleus of Meynert (NBM), also known as the Nucleus Basalis or Ch4, is the largest collection of cholinergic neurons in the basal forebrain. It provides the primary source of cortical acetylcholine and plays essential roles in attention, learning, memory, and arousal. The NBM is strategically positioned in the substantia innominata, with widespread projections to the entire neocortex, hippocampus, and amygdala. Degeneration of the NBM is a hallmark of Alzheimer's disease and contributes to cognitive decline in various dementias. The NBM serves as a critical therapeutic target for cholinergic replacement therapies and deep brain stimulation approaches. [@supsup2012]

Multi-Taxonomy Classification

Taxonomy Database Cross-References

PanglaoDB Marker Cross-References

Unknown (PanglaoDB):

External Database Links

[Cell Ontology (CL:0000646)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000646)
[OBO Foundry (CL:0000646)](http://purl.obolibrary.org/obo/CL_0000646)
[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/)
[PanglaoDB](https://panglaodb.se/)

Taxonomy & Classification

PanglaoDB Marker Cross-References

Unknown (PanglaoDB):

External Database Links

[Cell Ontology (CL:0000646)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000646)
[OBO Foundry (CL:0000646)](http://purl.obolibrary.org/obo/CL_0000646)
[Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
[CellxGene Census](https://cellxgene.cziscience.com/)
[PanglaoDB](https://panglaodb.se/)

Overview

The Basal Nucleus of Meynert (NBM) is the largest collection of cholinergic neurons in the basal forebrain and provides the primary source of cortical acetylcholine. It plays essential roles in attention, learning, memory, and arousal. Degeneration of the NBM is a hallmark of Alzheimer's disease and contributes to cognitive decline in various dementias.

Basal Nucleus of Meynert (Expanded)

The Basal Nucleus of Meynert (NBM) is the largest collection of cholinergic neurons in the basal forebrain. It provides the primary source of cortical acetylcholine and plays essential roles in attention, learning, memory, and arousal. Degeneration of the NBM is a hallmark of Alzheimer's disease and contributes to cognitive decline in various dementias[@supsup1988].

Morphology and Markers

The Basal Nucleus of Meynert consists of large, medium-sized cholinergic neurons:

Cell Types: Primarily large cholinergic projection neurons (~150,000-200,000 in human brain)
Molecular Markers:
ChAT (choline acetyltransferase) - definitive cholinergic marker
VAChT (vesicular acetylcholine transporter)
p75^NTR (p75 neurotrophin receptor) - low-affinity NGF receptor
TrkA (NTRK1) - high-affinity NGF receptor
Connectivity: Widespread projections to entire neocortex, hippocampus, and amygdala
Subdivisions: Ch1 (medial septum), Ch2 (vertical diagonal band), Ch3 (horizontal diagonal band), Ch4 (basal nucleus proper)

Normal Function

The NBM is essential for cortical activation and cognitive processing:

Cortical Acetylcholine Release: Provides ~70-90% of cortical cholinergic input

Attention Enhancement: Acetylcholine biases cortical processing toward behaviorally relevant stimuli

Memory Consolidation: Hippocampal-projecting NBM neurons support memory encoding and retrieval

Arousal Regulation: Part of ascending reticular activating system for wakefulness

Cortical Plasticity: Acetylcholine enhances experience-dependent cortical reorganization

Sensory Processing: Modulates sensory cortex sensitivity and discrimination

Disease Vulnerability

The NBM is prominently affected in several neurodegenerative conditions:

Alzheimer's Disease (AD): Severe loss of NBM cholinergic neurons (50-90%) is a hallmark, correlating with cognitive decline. Cholinergic depletion precedes cortical atrophy[@supsup2012].
Parkinson's Disease (PD): NBM degeneration contributes to PD dementia. Lewy bodies can form in NBM neurons.
Dementia with Lewy Bodies (DLB): NBM cholinergic loss is more severe than in PD, contributing to attentional deficits.
Vascular Dementia: White matter lesions can disrupt NBM-cortical pathways.
FTD: Variable NBM involvement depending on subtype.

Transcriptomic Profile

Single-nucleus RNA sequencing reveals distinct NBM populations:

Cholinergic Projection Neurons: High ChAT, VAChT, SLC18A3, and p75^NTR (NGFR) expression
GABAergic Interneurons: Local circuit neurons expressing Gad1, Gad2
Mixed Phenotype Neurons: Subpopulations expressing both cholinergic and GABAergic markers
Neurotrophin-Responsive Neurons: TrkA and TrkB expression for NGF and BDNF responsiveness
Transcription Factors: Lhx8, Gbx1 specifying cholinergic fate

Therapeutic Implications

The NBM is a major therapeutic target:

Cholinesterase Inhibitors: Donepezil, rivastigmine, galantamine - first-line AD treatments

NGF Therapy: Experimental NGF delivery to protect NBM neurons

Cholinergic Agonists: M1 muscarinic and nicotinic receptor agonists in development

Deep Brain Stimulation: NBM-DBS being explored for AD and dementia

Cell Therapy: Stem cell-derived cholinergic neuron transplantation approaches

Research Directions

Key research priorities:

Neuroprotection: Developing NGF/BDNF mimetics to preserve NBM neurons
Biomarkers: CSF and imaging markers of NBM integrity
Cell Replacement: iPSC-derived cholinergic neuron transplantation
Circuit-Specific Modulation: Optogenetic targeting of NBM-cortical circuits
Basal Forebrain
Cholinergic Neurons
Alzheimer's Disease
Acetylcholine
Nerve Growth Factor
Dementia with Lewy Bodies
Frontotemporal Dementia

External Links

[Basal Nucleus of Meynert - Wikipedia](https://en.wikipedia.org/wiki/Basal_nucleus_of_Meynert)
[Allen Brain Atlas - NBM](https://human.brain-map.org/microarray/search/show?search_term=basal%20nucleus%20of%20meynert)
[NeuroNames - NBM](https://ur definitions.openworm.org/species/human/branches/713)

Background

The study of Basal Nucleus Of Meynert (Expanded) 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.

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