Spinal Cord Lamina X 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)
Lamina X (also called the central gray matter or zone X) is a distinct region of the spinal cord that surrounds the central canal. This region is involved in visceral sensory processing, autonomic integration, and motor coordination["@rexed1952"]. Lamina X contains a heterogeneous population of neurons that play critical roles in transmitting sensory information from internal organs and coordinating autonomic functions["@molander1989"].
Lamina X forms a cylindrical zone around the central canal, approximately 50-100 μm in diameter in rodents and proportionally larger in humans[@watson2009]. The region contains:
Central Canal Ependymal Lining: Ciliated ependymal cells lining the central canal
Pericentral Neurons: Small to medium-sized neurons surrounding the canal
Commissural Neurons: Axons crossing the midline to contralateral sides
Neuropil: Dense network of dendrites and axonal processes
Cell Types
Lamina X contains diverse neuronal populations[@petkantchin2021]:
Molecular Markers
Calbindin D-28k: Calcium-binding protein expressed in central canal neurons[@calbindin1991]
Parvalbumin: Calcium-binding protein in inhibitory neurons
Nissl Substance: RER-rich cytoplasm for protein synthesis
Neurofilament (NF-M, NF-H): Structural proteins in axons
GFAP: Astrocytic markers in surrounding glia
Normal Function
Visceral Sensation
Lamina X is a critical hub for processing visceral sensory information[@ness1990]:
Pelvic Organ Sensation: Receives input from bladder, colon, and reproductive organs
Cardiovascular Inputs: Processes baroreceptor and chemoreceptor information
[Central Pattern Generators](/locomotion) — Motor circuits
Background
The study of Spinal Cord Lamina X 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.