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:0004349

uberon

sixth pharyngeal arch, branchial arch 4, sixth visceral arch, 6th pharyngeal arch, 6th visceral arch, fourth branchial 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]

UBERON:0003117

6

• recurrent laryngeal nerve

• laryngeal associated mesenchyme

• pharyngeal arch artery 6
• 6th arch mesenchyme