umls-concept:C1704529 | skos:definition | AOT: Areas of the axial skeleton where structure changes significantly leading to functional change. Transitional areas commonly include the following: occipitocervical region (OA), typically the OA-AA-C2 region is described. cervicothoracic region (CT), typically C7-T1. thoracolumbar region (TL), typically T10-L1. lumbosacral region (LS), typically L5-S1. | lld:umls |