part of part of develops from develops from skeleton of upper jaw pharyngeal arch 1 splanchnocranium subdivision of skeleton palatoquadrate arch EFO:0003659 dorsal visceral arch 1 UBERON:0011085 The dorsal portion of the first pharyngeal arch, comprising the upper jaw[ZFIN,VHOG]. upper pharyngeal jaw upper jaw ZFA:0001272 palatoquadrate arch dorsal mandibular arch upper pharyngeal jaw TAO:0001272 Subsequent vertebrate evolution has also involved major alterations to the pharynx; perhaps the most notable occurred with the evolution of the gnathostomes. This involved substantial modifications to the most anterior pharyngeal segments, with the jaw forming from the first, anterior, pharyngeal segment, while the second formed its supporting apparatus, the hyoid.[well established][VHOG] dorsal visceral arch 1 dorsal pharyngeal arch 1 Melissa Haendel Christopher J. Mungall