pharyngeal arch pharyngeal arch 6 6 6th arch 6th pharyngeal arch 6th 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:0010368 EHDAA2:0004075 EMAPA:32766 FMA:293047 TAO:0001601 The 6th pharyngeal arch. contributes to the development of the sternocleidomastoid and trapezius muscles The forth in a series of paired bars in the wall of the pharynx, within which are formed the forth aortic arch and the cartilage bar of the visceral skeleton, forms and supports the gills.[AAO] UBERON:0003117 UBERON:0004349 VHOG:0001205 XAO:0000453 ZFA:0001609 branchial arch 4 fourth branchial arch gill arch 4 sixth branchial arch sixth pharyngeal arch sixth visceral arch uberon visceral arch 6