[Subdivision of abdomen which is demarcated from the front of the abdomen by the posterior surface of the anterior layer of the thoracolumbar fascia and the anterior surface of the lumbar vertebral column; together with the front of the abdomen, it constitutes the abdomen. Examples: There is only one back of abdomen. ( UWDA )]
UMLS (HL7) C0024090 Relation/PAR: Body Part