OBO_REL:part_of (UNDECLARED) anatomical cluster gill arch 1-5 skeleton Skeletal and cartilaginous elements of the gill arches; the last five of the set of seven pharyngeal arches; the numbering system can be confusing; generally branchial arch #1 is the first gill arch, or the third pharyngeal arch, but some authors do not follow this convention. Kimmel et al, 1995. TAO:0000095 branchial arches gill arches 1-5 pharyngeal arch 3-7 skeleton teleost_anatomy visceral arches 3-7 splanchnocranium gill arch endoskeleton