Source:http://linkedlifedata.com/resource/umls/id/C0507777
UWDA: Organ part, which is countable and consist of a principal and one or more subsidiary tissues; (is divisible into basic tissues); connected to other organ components, it constitutes an organ subdivision. Examples: osteon, acinus, submucosa, capillary, papillary muscle, anterior leaflet of mitral valve, capsule of kidney, cortical bone, muscle fasciculus, anterior rootlet of spinal nerve.,FMA: Cardinal organ part which is bounded predominantly by bonafide boundaries. Examples: lobe of lung, osteon, acinus, submucosa, anterior leaflet of mitral valve, capsule of kidney, cortical bone, muscle fasciculus.