Source:http://linkedlifedata.com/resource/umls/id/C0501400
UWDA: Anatomical structure in which two or more anatomical structures establish physical continuity with one another or intermingle their component parts. Examples: gastroesophageal junction, line alba, knee joint.,FMA: Anatomical cluster in which parts of two or more anatomical structures establish physical continuity with one another or intermingle their component parts. Examples: gastroesophageal junction, line alba, knee joint.