Spinal Cord Lamina VII

Spinal Cord Lamina VII

Introduction

Spinal Cord Lamina Vii is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Lamina VII of the spinal cord is an intermediate zone containing interneurons, autonomic preganglionic neurons, and neurons involved in proprioceptive processing. This lamina forms a critical hub connecting sensory, motor, and autonomic circuits within the spinal cord. [@nattie2012]

<style> [@jankowska1992]
.infobox [@llewellynsmith2015]
.infobox th [@benarroch2008]
.infobox td [@low2013]
</style> [@kaufmann2020]

<div class="infobox"> [@dhaliwal2019]
<table>
<tr><th colspan="2" style="background:#4a90d9; color:white; text-align:center;">Spinal Cord Lamina VII</th></tr>
<tr><td><b>Category</b></td><td>Cell Types</td></tr>
<tr><td><b>Brain Region</b></td><td>Spinal Cord</td></tr>
<tr><td><b>Neuron Type</b></td><td>Mixed Interneurons</td></tr>
<tr><td><b>Species</b></td><td>Human, Mouse, Rat</td></tr>
<tr><td><b>Rexed Classification</b></td><td>Lamina VII</td></tr>
<tr><td><b>Associated Diseases</b></td><td>[ALS](/diseases/als), [MSA](/diseases/msa), [PD](/diseases/parkinsons-disease)</td></tr>
</table>
</style>

Overview

...

Spinal Cord Lamina VII

Introduction

Spinal Cord Lamina Vii is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Lamina VII of the spinal cord is an intermediate zone containing interneurons, autonomic preganglionic neurons, and neurons involved in proprioceptive processing. This lamina forms a critical hub connecting sensory, motor, and autonomic circuits within the spinal cord. [@nattie2012]

<style> [@jankowska1992]
.infobox [@llewellynsmith2015]
.infobox th [@benarroch2008]
.infobox td [@low2013]
</style> [@kaufmann2020]

<div class="infobox"> [@dhaliwal2019]
<table>
<tr><th colspan="2" style="background:#4a90d9; color:white; text-align:center;">Spinal Cord Lamina VII</th></tr>
<tr><td><b>Category</b></td><td>Cell Types</td></tr>
<tr><td><b>Brain Region</b></td><td>Spinal Cord</td></tr>
<tr><td><b>Neuron Type</b></td><td>Mixed Interneurons</td></tr>
<tr><td><b>Species</b></td><td>Human, Mouse, Rat</td></tr>
<tr><td><b>Rexed Classification</b></td><td>Lamina VII</td></tr>
<tr><td><b>Associated Diseases</b></td><td>[ALS](/diseases/als), [MSA](/diseases/msa), [PD](/diseases/parkinsons-disease)</td></tr>
</table>
</style>

Overview

Lamina VII is a large region occupying the intermediate zone of the spinal cord gray matter. It is bounded dorsally by lamina VI (when present) and ventrally by lamina VIII. This region contains remarkable cellular diversity, including:

• Propriospinal neurons: Interneurons that project to other spinal segments
• Autonomic preganglionic neurons: sympathetic and parasympathetic
• Visceral afferent integration neurons: Processing internal organ signals
• Local interneurons: Modulating local circuits

<!-- 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/)

Anatomy and Location

Spatial Organization

Lamina VII extends throughout the entire length of the spinal cord but shows segmental variation:

• Cervical enlargement: Larger, involved in forelimb control
• Thoracic segments: Prominent autonomic preganglionic populations
• Lumbar enlargement: Coordinates hindlimb movement
• Sacral segments: Parasympathetic preganglionic neurons

Boundaries

• Dorsal: Lamina VI (cervical/lumbar enlargements) or Lamina V
• Ventral: Lamina VIII (medial) and Lamina IX (lateral in motor regions)
• Lateral: Lateral funiculus
• Medial: Central canal region (lamina X)

Morphology

Key Features

• Location: Intermediate zone of spinal cord
• Cell types: Interneurons, preganglionic neurons, propriospinal neurons
• Connections: Commissural and ascending projections
• Neuropil: Rich in dendrites forming synaptic complexes

Neuronal Subtypes

Autonomic Preganglionic Neurons

• Sympathetic (T1-L2): Located in intermediolateral cell column
• Parasympathetic (S2-S4): Located in sacral parasympathetic nucleus
• Neurotransmitter: Acetylcholine (cholinergic)
• Function: Control of visceral organs

Propriospinal Neurons

• Long propriospinal: Connect cervical to lumbar segments
• Short propriospinal: Connect adjacent segments
• Function: Coordination of locomotion and posture

Visceral Interneurons

• Receive: Visceral afferents from internal organs
• Integrate: Sensory information for autonomic reflexes
• Project: To brainstem and hypothalamic nuclei

Molecular Markers

| Marker | Expression | Cell Type |
|--------|------------|-----------|
| ChAT | High | Preganglionic neurons |
| VGLUT2 | Moderate | Glutamatergic interneurons |
| GAD67 | Moderate | GABAergic interneurons |
| DIO2 | Moderate | Autonomic neurons |
| NK1R | Low | Subset of interneurons |
| FoxP1 | Moderate | Lamina VII projection neurons |
| Pax2 | Moderate | Inhibitory interneurons |

Normal Function

Autonomic Control

Sympathetic System (Thoracolumbar)

• Regulation of heart rate and blood pressure
• Pupillary control
• Gastrointestinal motility
• Sweat gland secretion
• Adrenal medulla activation

Parasympathetic System (Sacral)

• Bladder control (micturition)
• Bowel motility
• Sexual function
• Parasympathetic outflow to pelvic organs

Motor Control

Locomotor Circuits

• Coordination of fore-hindlimb movements
• Adjustment of gait patterns
• Postural control during movement

Propriospinal Integration

• Transmission of cortical commands to spinal circuits
• Integration of sensory feedback
• Coordination of axial musculature

Sensory Processing

Visceral Sensation

• Integration of signals from internal organs
• Processing of visceral pain
• Cardiorespiratory monitoring

Nociceptive Modulation

• Modulation of pain signals
• Interaction with descending pain pathways
• Integration with autonomic responses

Neurotransmitter Systems

Glutamatergic

• VGLUT2-expressing neurons
• Excitatory drive to motor neurons
• Ascending projections to thalamus

GABAergic/Glycinergic

• Inhibitory interneurons
• Presynaptic inhibition
• Motor neuron modulation

Cholinergic

• Preganglionic autonomic neurons
• Local circuit interneurons
• Neuromodulatory functions

Disease Vulnerability

Amyotrophic Lateral Sclerosis (ALS)

Lamina VII involvement in ALS:

• Motor neuron loss: Affects neighboring interneurons
• Autonomic dysfunction: Common in advanced disease
• Respiratory failure: Diaphragmatic and intercostal muscle control
• Pseudobulbar affect: Brainstem-spinal connections

Research findings:

• Decreased spinal cord interneurons in ALS patients
• Excitotoxicity affects lamina VII neurons
• Glial activation in intermediate zone
• Autonomic dysfunction correlates with disease progression

Multiple System Atrophy (MSA)

Lamina VII is particularly vulnerable in MSA:

• Autonomic failure: Loss of preganglionic neurons
• Olivopontocerebellar atrophy: Connections through propriospinal pathways
• Striatonigral degeneration: Motor circuit involvement

Pathological features:

• α-Synuclein inclusions in autonomic neurons
• Neuronal loss in intermediolateral cell column
• Gliosis in lamina VII

Parkinson's Disease

Autonomic dysfunction in PD:

• Orthostatic hypotension: Sympathetic denervation
• Urinary dysfunction: Parasympathetic involvement
• Gastrointestinal issues: Enteric nervous system connections

Lamina VII involvement:

• Loss of dopaminergic modulation
• Autonomic preganglionic neuron dysfunction
• Propriospinal circuit abnormalities

Other Neurodegenerative Conditions

Spinal Muscular Atrophy (SMA)

• Early loss of motor circuit interneurons
• Autonomic involvement in severe forms

Hereditary Spastic Paraplegia (HSP)

• Corticospinal tract degeneration affects lamina VII function
• Propriospinal neuron pathology

Vitamin B12 Deficiency (Subacute Combined Degeneration)

• Dorsal column and corticospinal tract involvement
• Secondary effects on lamina VII interneurons

Connections and Pathways

Ascending Pathways

• Spinothalamic: Visceral pain transmission
• Spinoreticular: Arousal and autonomic integration
• Spinocerebellar: Proprioceptive information

Descending Pathways

• Reticulospinal: Postural control
• Rubrospinal: Motor modulation
• Vestibulospinal: Balance and posture

Commissural Connections

• Bilateral coordination
• Interhemispheric communication
• Synchronization of segmental activity

Therapeutic Implications

Drug Targets

• Cholinergic receptors: Modulate autonomic function
• GABA-B receptors: Reduce excitability
• 5-HT receptors: Pain modulation

Gene Therapy

• Delivery to autonomic neurons
• Targeting propriospinal circuits

Neuromodulation

• Spinal cord stimulation
• Targeted stimulation of autonomic pathways

See Also

• [Spinal Cord](/brain-regions/spinal-cord)
• [Autonomic Nervous Systementities/autonomic-nervous-system)](/entities/autonomic-nervous-system)
• [Motor Neurons](/cell-types/motor-neurons)
• [Lamina I Projection Neurons](/cell-types/lamina-i-projection-neurons)
• [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
• [Multiple System Atrophy](/diseases/multiple-system-atrophy)