postaxialmost part of proximally connected to Homo sapiens ulna proximal carpal bone ulnare http://upload.wikimedia.org/wikipedia/commons/5/50/Carpus.png cuneiform of hand triangular Wikipedia:Triquetral NCIT:C12858 ulnar carpal bone The postaxial bone of the proximal carpal region. Found in close approximation to the ulna, often in articulation[PHENOSCAPE:ad]. AAO:0000845 FMA:23715 One of two element that constitute the basal row of carpals. It articulates with the ulna, radius, radiale, centrale (element Y), and carpal 5(4). This element originates from one condensation center or the fusion of two elements (ulnare and intermedium). Occasionally it may fuse to carpal 5(4), the radiale, or other elements.[AAO] triangular bone os triquetrum this bone is termed the triquetral bone in some mammalian taxa, notably humans SCTID:181965000 MA:0001347 triquetral UMLS:C0223739 UBERON:0002445 cuneiform bone of hand galen:Triquetral EMAPA:36167 triquetral bone os ulnare triquetrum cuneiform bone of manus carpal skeleton Melissa Haendel Christopher J. Mungall