in taxon Bilateria organism subdivision dorsum http://upload.wikimedia.org/wikipedia/commons/e/ee/432px-Gray-back.PNG 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 UMLS:C0004600 GAID:30 BTO:0001713 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.. Wikipedia:Dorsum_(anatomy) FMA:14181 dorsal galen:Back MESH:D001415 NCIT:C13062 UBERON:0001137 SCTID:123961009 dorsal part of organism back CALOHA:TS-2223 EFO:0001405 back of body proper