Rexed laminae

The Rexed laminae comprise a system of ten layers of grey matter (I-X), identified in the early 1950s by Bror Rexed to label portions of the spinal cord. ^[1][2]

Similar to Brodmann areas, they are defined by their cellular structure rather than by their location, but the location still remains reasonably consistent.

Laminae

• Posterior/dorsal horn: I-VI
  • Lamina I: marginal nucleus of spinal cord or posteromarginal nucleus
  • Lamina II: substantia gelatinosa of Rolando
  • Laminae III/IV: nucleus proprius
  • Lamina V: Neck of the dorsal horn
  • Lamina VI: Base of the dorsal horn,
• Intermediate zone: VII and X
  • Lamina VII: intermediomedial nucleus, intermediolateral nucleus, nucleus dorsalis in the thoracic and upper lumbar region
  • Lamina X: central gray matter i.e. neurons bordering Central canal
• Anterior/ventral horn: VIII-IX
  • Lamina VIII: motor interneurons
  • Lamina IX: lateral (in limb regions) and medial motor neurons, also phrenic and spinal accessory nuclei at cervical levels, and Onuf's nucleus in the sacral region

References

1. ^ Rexed B (1952). "The cytoarchitectonic organization of the spinal cord in the cat.". J Comp Neurol 96 (3): 414–95. doi:10.1002/cne.900960303. PMID 14946260. 
2. ^ Rexed B (1954). "A cytoarchitectonic atlas of the spinal cord in the cat.". J Comp Neurol 100 (2): 297–379. doi:10.1002/cne.901000205. PMID 13163236.