part of part of appendage organism subdivision subdivision of organism along appendicular axis FBbt:00007018 appendicular segment UBERON:0010758 A major subdivision of an organism that divides an organism along an axis perpedicular to the main body anterior-posterior axis. In vertebrates, this is typically a fin or limb segment. In insects, this includes segments of appendages such as antennae, as well as segments of the insect leg. appendage segment