organism subdivision dorsum A major subdivision of an organism that is the entire part of the organism dorsal to a horizontal plane and bounded on one side by the same transverse plane. In vertebrares this includes the vertebral column.. BTO:0001713 CALOHA:TS-2223 EFO:0001405 FMA:14181 GAID:30 In humans, called the back, a large posterior area of the human body, rising from the top of the buttocks to the back of the neck and the shoulders. It is the surface opposite to the chest, its height being defined by the vertebral column (commonly referred to as the spine or backbone) and its breadth being supported by the ribcage and shoulders. The spinal canal runs through the spine and provides nerves to the rest of the body MESH:A01.176 OpenCyc:Mx4rvVkEU5wpEbGdrcN5Y29ycA UBERON:0001137 UMLS:C0004600 back back of body proper dorsal dorsal part of organism galen:Back uberon