Infralimbic Cortex Pyramidal Neurons
Infralimbic Cortex Pyramidal Neurons
<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Infralimbic Cortex Pyramidal Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000598](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000598](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)</td>
</tr>
<tr>
<td class="label">
Full Name</td>
<td>Infralimbic Cortex Pyramidal Neurons</td>
</tr>
<tr>
<td class="label">
Abbreviation</td>
<td>IL</td>
</tr>
<tr>
<td class="label">
Location</td>
<td>Medial prefrontal cortex, ventral to the prelimbic cortex, Brodmann area 32/25</td>
</tr>
<tr>
<td class="label">
Cell Type</td>
<td>Glutamatergic pyramidal neurons</td>
</tr>
<tr>
<td class="label">
Layer</td>
<td>Layer 2/3 and Layer 5</td>
</tr>
<tr>
<td class="label">
Allen Atlas ID</td>
<td>Mouse: 170</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">
CaMKIIα (Camk2a)</td>
<td>High</td>
</tr>
<tr>
<td class="label">
Vglut1 (Slc17a7)</td>
<td>High</td>
</tr>
<tr>
<td cl
...Infralimbic Cortex Pyramidal Neurons
Infralimbic Cortex Pyramidal Neurons
<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Infralimbic Cortex Pyramidal Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000598](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000598](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)</td>
</tr>
<tr>
<td class="label">
Full Name</td>
<td>Infralimbic Cortex Pyramidal Neurons</td>
</tr>
<tr>
<td class="label">
Abbreviation</td>
<td>IL</td>
</tr>
<tr>
<td class="label">
Location</td>
<td>Medial prefrontal cortex, ventral to the prelimbic cortex, Brodmann area 32/25</td>
</tr>
<tr>
<td class="label">
Cell Type</td>
<td>Glutamatergic pyramidal neurons</td>
</tr>
<tr>
<td class="label">
Layer</td>
<td>Layer 2/3 and Layer 5</td>
</tr>
<tr>
<td class="label">
Allen Atlas ID</td>
<td>Mouse: 170</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">
CaMKIIα (Camk2a)</td>
<td>High</td>
</tr>
<tr>
<td class="label">
Vglut1 (Slc17a7)</td>
<td>High</td>
</tr>
<tr>
<td class="label">
FOXP2</td>
<td>High</td>
</tr>
<tr>
<td class="label">
Reelin</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">
Bcl11b (CTIP2)</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">
Rorb</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">
Satb2</td>
<td>Moderate</td>
</tr>
</table>
Introduction
Infralimbic Cortex Pyramidal 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.
Overview
Mermaid diagram (expand to render)
Infralimbic Cortex Pyramidal Neurons is a specialized neuronal population involved in emotion regulation and executive function. These neurons play critical roles in fear extinction, decision-making, and working memory and are vulnerable in various neurodegenerative diseases. [@sotresbayon2006]
Infralimbic Cortex (IL) Pyramidal Neurons
The Infralimbic Cortex (IL) is a medial prefrontal cortex region that plays a crucial role in emotional regulation, fear extinction, reward processing, and autonomic control. Located in the ventral portion of the prefrontal cortex, IL pyramidal neurons are key integrators of limbic and autonomic information. [@etkin2007]
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Multi-Taxonomy Classification
Taxonomy Database Cross-References
Morphology & Electrophysiology
- Morphology: pyramidal neuron (source: Cell Ontology)
- Morphology can be inferred from Cell Ontology classification
PanglaoDB Marker Cross-References
External Database Links
- [Cell Ontology (CL:0000598)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)
- [OBO Foundry (CL:0000598)](http://purl.obolibrary.org/obo/CL_0000598)
- [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
External Database Links
- [Cell Ontology (CL:0000598)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)
- [OBO Foundry (CL:0000598)](http://purl.obolibrary.org/obo/CL_0000598)
- [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/)
Quick Facts
Morphology and Markers
Cellular Morphology
IL pyramidal neurons exhibit characteristic pyramidal morphology:
- Triangular soma (15-25 μm diameter)
- Apical dendrite extending toward the pial surface
- Basal dendrites radiating laterally
- Long apical shaft with extensive branching in Layer 1
- Spiny dendrites receiving excitatory inputs
Molecular Markers
Key molecular markers for IL pyramidal neurons:
- CaMKIIα - calcium/calmodulin-dependent protein kinase II, excitatory neuron marker
- Vglut1 (Slc17a7) - vesicular glutamate transporter 1
- Cux1 (Layer 2/3) - cut-like homeobox 1, upper layer marker
- CTIP2 (Bcl11b) - Layer 5 marker
- ER81 - transcription factor for subcortical projection neurons
- FOXP2 - language/communication-related transcription factor
Normal Function
Fear Extinction
The Infralimbic Cortex is the primary cortical region for fear extinction:
- Receives safety signals from the hippocampus and amygdala
- Projects to the basal amygdala to inhibit fear responses
- Critical for updating fear memories with new safety information
- Lesions produce deficits in extinction recall
Emotional Regulation
IL plays a key role in regulating emotional responses:
- Top-down control over amygdala reactivity
- Inhibition of stress responses
- Regulation of anxiety-like behaviors
- Emotional processing of reward and punishment
Autonomic Control
- Projects to hypothalamic autonomic centers
- Regulates heart rate, blood pressure, and visceral function
- Coordinates endocrine responses to stress
- Mediates the cortical component of the autonomic nervous system
Reward Processing
- Encodes reward prediction errors
- Involved in reward-guided decision making
- Projects to ventral striatum and pallidum
- Modulates motivated behavior
Vulnerability in Neurodegenerative Diseases
Alzheimer's Disease
- Early involvement: The IL shows early tau pathology in AD (Braak Stage III-IV)
- Functional deficits: Reduced metabolism and hyperexcitability in early AD
- Emotional symptoms: IL dysfunction contributes to anxiety, depression, and agitation
- Autonomic dysfunction: Contributes to dysregulated stress responses and autonomic symptoms
Parkinson's Disease
- Executive dysfunction: IL connectivity is disrupted, affecting decision-making
- Impulse control disorders: IL dysfunction implicated in ICDs (gambling, shopping, hypersexuality) induced by dopamine agonists
- Depression: IL hypometabolism common in PD depression
- Autonomic symptoms: Contributes to autonomic dysfunction in PD
Frontotemporal Dementia
- Primary target: The IL is heavily affected in behavioral variant FTD (bvFTD)
- Disinhibition: IL degeneration contributes to impulsivity and inappropriate behavior
- Emotional blunting: Loss of emotional regulation capacity
- Loss of empathy: Social-emotional processing deficits
Huntington's Disease
- Early involvement: IL shows early metabolic and functional changes
- Emotional dysregulation: Contributes to irritability, aggression, and mood symptoms
- Executive deficits: Disrupted prefrontal networks affect planning and decision-making
Transcriptomic Profile
Key differentially expressed genes in Infralimbic Cortex (from Allen Brain Atlas):
Therapeutic Implications
Transcranial Magnetic Stimulation
- High-frequency rTMS to mPFC including IL may improve depression and anxiety
- Target for treatment-resistant depression
- Potential for cognitive enhancement in AD/PD
Deep Brain Stimulation
- IL is being explored as a target for depression and OCD
- Connections to downstream structures make it an attractive target
Pharmacological Approaches
- SSRIs: Enhance IL function and fear extinction
- NMDA antagonists: May enhance extinction learning
- Dopamine agonists: Must be carefully managed to avoid ICDs
Connections
- Hippocampus (ventral CA1, subiculum)
- Basolateral amygdala
- Parabrachial nucleus (visceral sensory)
- Thalamic mediodorsal nucleus
Efferent Projections
- Basal amygdala (inhibitory control)
- Ventral striatum (reward)
- Hypothalamic nuclei (autonomic)
- Periaqueductal gray (pain modulation)
- Prelimbic Cortex Pyramidal Neurons
- Anterior Cingulate Cortex Pyramidal Neurons
- Medial Prefrontal Cortex
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Frontotemporal Dementia](/diseases/frontotemporal-dementia)
Background
The study of Infralimbic Cortex Pyramidal 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.
Disease Vulnerability
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Frontotemporal Dementia](/diseases/frontotemporal-dementia)
References
- [Prefrontal Cortex](/brain-regions/prefrontal-cortex)
- Br- Parkinson's Disease
- Executive Function Pathway
External Links
- [BrainMaps Project](https://brainmaps.org/)
- [Neuroscience Literature](https://pubmed.ncbi.nlm.nih.gov/)
- [Allen Brain Atlas](https://brain-map.org/)
Pathway Diagram
The following diagram shows the key molecular relationships involving Infralimbic Cortex Pyramidal Neurons discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)