Spinal Dorsal Horn (Expanded)

Spinal Dorsal Horn (Expanded)

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Spinal Dorsal Horn (Expanded)</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:2000048](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000048)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:2000048](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000048)</td>
</tr>
<tr>
<td class="label">Molecule</td>
<td>Receptor</td>
</tr>
<tr>
<td class="label">Glutamate</td>
<td>NMDA/AMPA</td>
</tr>
<tr>
<td class="label">Substance P</td>
<td>NK1R</td>
</tr>
<tr>
<td class="label">CGRP</td>
<td>CALCRL</td>
</tr>
<tr>
<td class="label">ATP</td>
<td>P2X3</td>
</tr>
</table>

Spinal Dorsal Horn (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

The Spinal Dorsal Horn is the sensory gateway of the spinal cord, processing somatosensory information including touch, temperature, and pain. It is a critical site for pain modulation and a major target for analgesic therapies. [@woolf1999]

<!-- taxonomy-enrichment --> [@latremoliere2020]

Spinal Dorsal Horn (Expanded)

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Spinal Dorsal Horn (Expanded)</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:2000048](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000048)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:2000048](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000048)</td>
</tr>
<tr>
<td class="label">Molecule</td>
<td>Receptor</td>
</tr>
<tr>
<td class="label">Glutamate</td>
<td>NMDA/AMPA</td>
</tr>
<tr>
<td class="label">Substance P</td>
<td>NK1R</td>
</tr>
<tr>
<td class="label">CGRP</td>
<td>CALCRL</td>
</tr>
<tr>
<td class="label">ATP</td>
<td>P2X3</td>
</tr>
</table>

Spinal Dorsal Horn (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

The Spinal Dorsal Horn is the sensory gateway of the spinal cord, processing somatosensory information including touch, temperature, and pain. It is a critical site for pain modulation and a major target for analgesic therapies. [@woolf1999]

<!-- taxonomy-enrichment --> [@latremoliere2020]

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

Multi-Taxonomy Classification

Taxonomy Database Cross-References

Morphology & Electrophysiology

• Morphology: anterior horn motor neuron (source: Cell Ontology)
• Morphology can be inferred from Cell Ontology classification

External Database Links

• [Cell Ontology (CL:2000048)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000048)
• [OBO Foundry (CL:2000048)](http://purl.obolibrary.org/obo/CL_2000048)
• [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/)

Taxonomy & Classification

External Database Links

• [Cell Ontology (CL:2000048)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000048)
• [OBO Foundry (CL:2000048)](http://purl.obolibrary.org/obo/CL_2000048)
• [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
• [CellxGene Census](https://cellxgene.cziscience.com/)

Overview

The Spinal Dorsal Horn is the dorsal portion of the spinal cord gray matter that processes somatosensory information, particularly pain and temperature sensation. This layered structure receives input from primary sensory [neurons](/entities/neurons) and modulates nociceptive transmission through complex intrinsic circuits before projecting to the brain. [@cohen2014]

In neurodegenerative diseases, the dorsal horn shows involvement in conditions affecting sensory processing. Amyotrophic lateral sclerosis can include sensory neuron involvement affecting dorsal horn function. Small fiber neuropathy, common in diabetes and sometimes seen in [Parkinson's disease](/diseases/parkinsons-disease), involves dysfunction of the peripheral fibers terminating in the dorsal horn. [@finnerup2015]

Morphology and Markers

The dorsal horn is organized into laminae (Rexed):

Lamina I (Marginal Zone)

• Nociceptive-specific neurons: ~40%
• WDR neurons: ~30%
• CGRP-positive: ~25%
• μ-opioid receptor: High density

Lamina II (Substantia Gelatinosa)

• Interneurons: Mostly inhibitory
• PKCγ neurons: ~20%
• Somatostatin: ~30%
• GAD67: ~80% GABAergic

Lamina III-IV (Nucleus Proprius)

• Mechanosensitive neurons: Touch, pressure
• Parvalbumin: ~40%
• VGLUT2: Primary sensory input

Lamina V-VI

• Viscerosomatic convergence
• Wide dynamic range neurons
• High threshold mechanoreceptors

Normal Function

The dorsal horn processes:

Key Neurotransmitters

• Glutamate: Primary excitatory ([NMDA](/entities/nmda-receptor), AMPA, kainate)
• Substance P: Nociceptive transmission (NK1R)
• CGRP: Pain signaling
• GABA: Inhibition
• Glycine: Spinal inhibition
• Endogenous opioids: Analgesia

Disease Vulnerability

Alzheimer's Disease (AD)

• Pain perception: Altered pain thresholds
• Neuropathic pain: Increased risk
• Somatosensory deficits: Tactile dysfunction

Parkinson's Disease (PD)

• Pain syndromes: Chronic pain in PD
• Sensory abnormalities: Paresthesias

Amyotrophic Lateral Sclerosis (ALS)

• Sensory involvement: Often underestimated
• Neuropathic pain: Common comorbidity

Chronic Pain Conditions

• Neuropathic pain: Diabetic neuropathy
• Fibromyalgia: Central sensitization
• Chronic migraine: Trigeminal dorsal horn

Molecular Mechanisms

Pain Transmission Pathways

Central Sensitization

• NMDA receptor phosphorylation: Activity-dependent
• Microglial activation: P2X4, TLR signaling
• BDNF release: Neuronal plasticity
• Cytokine signaling: IL-1β, TNFα

Therapeutic Implications

See Also

• [Pain](/entities/pain)
• [Nociception](/entities/nociception)
• [Spinal Cord](/brain-regions/spinal-cord)
• [Neuropathic Pain](/diseases/neuropathic-pain)

Background

The study of Spinal Dorsal Horn (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.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data