Rexed laminae

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

Lamina I: posteromarginal nucleus
Laminae II/III: substantia gelatinosa
Laminae III/IV/V: nucleus proprius
Lamina VII: nucleus dorsalis and intermediolateral nucleus
Lamina VIII: motor interneurons
Lamina IX: motor neurons
Lamina X: neurons bordering Central canal

Laminae I through VI constitute the dorsal horn. Laminae VII through IX constitute the ventral horn.

[edit] References

Rexed B (1952). "The cytoarchitectonic organization of the spinal cord in the cat.". J Comp Neurol 96 (3): 414-95. PMID 14946260.
Rexed B (1954). "A cytoarchitectonic atlas of the spinal cord in the cat.". J Comp Neurol 100 (2): 297-379. PMID 13163236.