<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Anterior Olfactory Nucleus (AON) Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000207](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000207)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000207](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000207)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000626](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000626)</td>
</tr>
<tr>
<td class="label">Feature</td>
<td>Description</td>
</tr>
<tr>
<td class="label">Cell Types</td>
<td>Pyramidal neurons (glutamatergic), stellate interneurons (GABAergic)</td>
</tr>
<tr>
<td class="label">Marker Genes</td>
<td>SLC17A6 (VGLUT2), GAD1, GAD2, CTIP2 (SATB2)</td>
</tr>
<tr>
<td class="label">Location</td>
<td>Dorsal olfactory cortex, rostral to the olfactory tubercle</td>
</tr>
<tr>
<td class="label">Afferents</td>
<td>Olfactory bulb mitral/tufted cells</td>
</tr>
<tr>
<td class="label">Efferents</td>
<td>Piriform cortex, entorhinal cortex, orbitofrontal cortex</td>
</tr>
<tr>
<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Anterior Olfactory Nucleus (AON) Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000207](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000207)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000207](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000207)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000626](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000626)</td>
</tr>
<tr>
<td class="label">Feature</td>
<td>Description</td>
</tr>
<tr>
<td class="label">Cell Types</td>
<td>Pyramidal neurons (glutamatergic), stellate interneurons (GABAergic)</td>
</tr>
<tr>
<td class="label">Marker Genes</td>
<td>SLC17A6 (VGLUT2), GAD1, GAD2, CTIP2 (SATB2)</td>
</tr>
<tr>
<td class="label">Location</td>
<td>Dorsal olfactory cortex, rostral to the olfactory tubercle</td>
</tr>
<tr>
<td class="label">Afferents</td>
<td>Olfactory bulb mitral/tufted cells</td>
</tr>
<tr>
<td class="label">Efferents</td>
<td>Piriform cortex, entorhinal cortex, orbitofrontal cortex</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">SLC17A6</td>
<td>High</td>
</tr>
<tr>
<td class="label">GAD1/GAD2</td>
<td>Interneurons</td>
</tr>
<tr>
<td class="label">CTIP2</td>
<td>Pyramidal neurons</td>
</tr>
<tr>
<td class="label">SOX2</td>
<td>Progenitors</td>
</tr>
<tr>
<td class="label">BDNF</td>
<td>Pyramidal neurons</td>
</tr>
<tr>
<td class="label">NTRK2</td>
<td>Pyramidal neurons</td>
</tr>
<tr>
<td class="label">Source</td>
<td>Projection</td>
</tr>
<tr>
<td class="label">Olfactory bulb</td>
<td>Mitral/tufted cell axons</td>
</tr>
<tr>
<td class="label">Tufted cells</td>
<td>Sustained firing</td>
</tr>
<tr>
<td class="label">Mitral cells</td>
<td>Pattern coding</td>
</tr>
<tr>
<td class="label">Target</td>
<td>Function</td>
</tr>
<tr>
<td class="label">Piriform cortex</td>
<td>Odor perception</td>
</tr>
<tr>
<td class="label">Entorhinal cortex</td>
<td>Memory formation</td>
</tr>
<tr>
<td class="label">Orbitofrontal cortex</td>
<td>Odor identification</td>
</tr>
</table>
Anterior Olfactory Nucleus (Aon) 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.
The Anterior Olfactory Nucleus (AON) is a critical structure in the olfactory system that serves as the primary relay and processing center for olfactory information traveling from the olfactory bulb to higher cortical areas. Located in the rostral part of the olfactory cortex, the AON plays essential roles in odor discrimination, olfactory memory, and the initial stages of olfactory perception.
The Anterior Olfactory Nucleus (AON) is a critical relay station in the olfactory system located in the rostral olfactory bulb and extending into the olfactory tract. As the first cortical region to receive processed olfactory information, the AON plays a fundamental role in odor discrimination, pattern separation, and olfactory memory consolidation. The AON receives input from the olfactory bulb's mitral and tufted cells and projects to the piriform cortex, entorhinal cortex, and other olfactory cortical areas. In neurodegenerative diseases, the olfactory system is often affected early, with the AON showing pathological changes in both Alzheimer's disease (where it exhibits early tau pathology and amyloid deposition) and Parkinson's disease (where it is one of the earliest sites of alpha-synuclein Lewy pathology). The AON's early involvement makes it a potential biomarker site for disease progression and a target for olfactory-based diagnostic approaches.
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The AON contains both glutamatergic and GABAergic neuronal populations with distinct morphologies:
The Anterior Olfactory Nucleus serves several critical functions in the olfactory system:
The Anterior Olfactory Nucleus shows remarkable vulnerability in several neurodegenerative diseases, often exhibiting early pathological changes:
Single-cell transcriptomic studies reveal distinct neuronal populations in the AON:
Understanding AON vulnerability provides therapeutic opportunities [@doty2017] [@postuma2016]:
Olfactory testing has emerged as a valuable tool for neurodegenerative disease diagnosis [@mesholam1998] [@hawkes1997]:
The AON forms a crucial node in the olfactory network [@seaberg2002]:
[^1] Thomassen, J., & Bouthour, W. (2021). Olfactory dysfunction in neurodegenerative diseases: A window into the brain. Journal of Neurology, 268(10), 3557-3572.
[^2] Attems, J., et al. (2014). Olfactory pathology in neurodegenerative diseases. Cell and Tissue Research, 358(1), 1-15.
[^3] Wilson, R.S., et al. (2011). Olfactory impairment in mild cognitive impairment and Alzheimer's disease. Journal of the American Geriatrics Society, 59(8), 1383-1390.
[^4] Doty, R.L. (2017). Olfactory dysfunction in neurodegenerative diseases. Handbook of Clinical Neurology, 164, 3-18.
[^5] Mesholam, R.I., et al. (1998). Olfaction in neurodegenerative disease: A meta-analysis. Annals of Neurology, 44(1), 43-51.
[^6] Braak, H., et al. (2003). Staging of the intracerebral inclusion body pathology associated with idiopathic Parkinson's disease. Neurobiology of Aging, 24(2), 197-211.
[^7] Kovács, T., et al. (2001). Alpha-synuclein in the human olfactory system. Journal of Comparative Neurology, 441(1), 58-67.
[^8] Beach, T.G., et al. (2009). Olfactory bulb alpha-synucleinopathy in Alzheimer's disease, Lewy body disease, and Parkinson's disease. Brain Research, 1295, 183-191.
The study of Anterior Olfactory Nucleus (Aon) 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.
<sup>[[1]](https://pubmed.ncbi.nlm.nih.gov/17093090/)</sup> Olfactory dysfunction in Parkinson disease. PMID: 17093090(https://pubmed.ncbi.nlm.nih.gov/17093090/)
The following diagram shows the key molecular relationships involving Anterior Olfactory Nucleus (AON) Neurons discovered through SciDEX knowledge graph analysis: