pharyngeal arch pharyngeal arch 2 2 2nd arch 2nd pharyngeal arch 2nd visceral arch A conserved feature of all vertebrate embryos is the presence of a series of bulges on the lateral surface of the head, the pharyngeal arches; it is within these structures that the nerves, muscles and skeletal components of the pharyngeal apparatus are laid down. The pharyngeal arches are separated by endodermal outpocketings, the pharyngeal pouches.[well established][VHOG] AAO:0010363 EHDAA2:0000050 EHDAA:611 EMAPA:16272 FMA:293017 TAO:0001596 The second of the series of bony or cartilaginous arches that develop in the walls of the mouth cavity and pharynx of the embryo.[AAO] The second pharyngeal arch will form the hyoid apparatus. The cranial neural crest cells that populate the second pharyngeal arch emerge primarily from rhombomere 4 and will form skeletal elements. UBERON:0003066 VHOG:0000297 XAO:0000098 ZFA:0001611 arcus pharyngeus secundus branchial arch 2 hyoid arch hyoid bars in XAO, develops from visceral pouch 2 pharyngeal arch 2 pharyngeal arches 2 second branchial arch second pharyngeal arch second visceral arch uberon visceral arch 2