File:Medulla spinalis - Substantia grisea - English.svg File:Spinalcord trirev rexedlamina.svg 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.
- I-VI: Posterior/dorsal horn
- VII-IX: Anterior/ventral horn
- Lamina X: neurons bordering Central canal
- Overview at University of the West Indies
- Overview at University of Medicine and Dentistry of New Jersey