Source:http://linkedlifedata.com/resource/umls/id/C0503895
UWDA: Anatomical space, which connects two or more body spaces with one another; is surrounded by subdivisions of two or more organs; contains subdivisions of organs, or one or more body substances. Examples: intervertebral foramen (canal), pharyngotympanic tube, inguinal canal, carpal canal, superior thoracic aperture, pelvic inlet.,FMA: Anatomical space which connects two or more compartment spaces or two or more anatomical cavities. Examples: foramen magnum, pyloric orifice, space of right inguinal canal, nutrient canal space,,FMA: Anatomical cluster which connects two or more compartments or two or more organ parts.