part of part of has part has part has developmental contribution from skeleton of jaw skeleton AAO:0000988 BTO:0001749 EMAPA:35455 FMA:54396 GAID:214 MA:0001905 MESH:D007568 OpenCyc:Mx4rvVjjEZwpEbGdrcN5Y29ycA Skeletal and cartilage elements of the first pharyngeal arch.[TAO] Subdivision of skeleton which includes upper and lower jaw skeletons. TAO:0001227 TODO - move ZFA:0001227 (it is the entire jaw skeleton). There are cellular contributions from all three embryonic germ layers: pharyngeal mesoderm, endoderm and neural crest that migrates out of the ectoderm (Noden, 1983). UBERON:0001708 UMLS:C0022359 ZFA:0001227 anterior splanchnocranium galen:Jaw in FMA, the jaw is an organism subdivision cluster, and includes mucosal tissue such as the gingiva as parts. It appears to be skeletal in MA (and has teeth as parts). It is reasonable to assume that ZFA and XAO consider the upper and lower jaws to be skeletal elements or clusters. EHDAA2 also considers these clusters. TODO - follow EHDAA2 model. These arbitrary differences in terminology and classification have to be reconciled with the genuine well-known biological differences in the skeletal elements across vertebrates jaw jaw cartilage jaws mandibular arch mandibular arch skeleton oral jaw skeleton pharyngeal arch 1 skeleton uberon visceral arch 1 neural crest splanchnocranium neural crest-derived structure subdivision of skeleton facial skeleton jaw region