human_reference_atlas part of Homo sapiens tetrapod parietal bone http://upload.wikimedia.org/wikipedia/commons/2/21/Gray132.png MA:0001469 In humans: bone forming side and roof of cranium. Each bone is irregularly quadrilateral in form, and has two surfaces, four borders, and four angles. UMLS:C0030558 The homologization of cranial bones of actinopterygians with those of sarcopterygians based on the bone names established in human anatomy is favored in order to permit the building of phylogenetic relationship schemes beyond the taxonomic boundaries of osteichthyans (including tetrapods). (...) In actinopterygians, the terms parietal and postparietal bones have to replace the commonly used terms 'frontal' and 'parietal' bones for the two paired bones on the skull roof.[well established][VHOG] actinopterygian frontal bone FMA:9613 AAO:0000390 NCIT:C12766 parietal bone uberon parietal bone GAID:229 parietal VHOG:0001324 MESH:D010294 frontal bone EMAPA:18715 The frontal bone in teleost fish is the homolog of the parietal bone in tetrapods[various]. In many non-mammalian tetrapods, they are bordered to the rear by a pair of postparietal bones that may be solely in the roof of the skull, or slope downwards to contribute to the back of the skull, depending on the species. In the living tuatara, and many fossil species, a small opening, the parietal foramen, lies between the two parietal bones. This opening is the location of a third eye in the midline of the skull, which is much smaller than the two main eyes VHOG:0001326 UBERON:0000210 SCTID:181794000 AS os parietale parietal bone Wikipedia:Parietal_bone neurocranium intramembranous bone flat bone