Source:http://linkedlifedata.com/resource/umls/id/C0927221
FMA: Material anatomical entity which consists of the maximum number of discontinuous members of the same class. Examples: set of cranial nerves, ventral branches of aorta, set of mammary arteries, thoracic viscera, dental arcade.,UWDA: Anatomical structure which consists of members that are body part subdivisions, organ system subdivisions, organs, organ parts or cell parts of the same class and may or may not be continuous or interconnected with one other. Examples: set of cranial nerves, ventral branches of aorta, set of mammary arteries, thoracic viscera, dental arcade.