Insects are the only one non-vertebrate flyer group.Â
https://en.m.wikipedia.org/wiki/File:Sclerites_of_insect_wing.svg
The wing of an insect is very different from that of verterbrates.
The lifting surface is a membrane, which is supported by veins.
veins carry blood and air passages.
Veins are anchored to a complex set of tiny skeletal structures, axillary sclerites, that make up the wing hinge or articulation [1].