anatomical structure surface structure AAO:0010337 AEO_RETIRED:0000010 Anatomical structure that overlaps the outer epithelial layer and is adjacent to the space surrounding the organism. EHDAA2_RETIRED:0003010 Organism subdivision which is the collection of anatomical structures on the body surface.[ZFA] TAO:0000292 UBERON:0003102 VSAO:0000001 XAO:0003028 ZFA:0000292 anatomical surface feature galen:SurfaceRegion surface feature surface region uberon