part of develops from wing vein fly_anatomy.ontology UBERON:0003194 FBbt:00004751 Wing veins are epidermal sclerotizations above hemolymph lacunae that run between the dorsal and the ventral wing surfaces and carry trachea and nerves. The two-dimensional pattern of wing veins is the result of the cuticular differentiation of stripes of epidermal cells on the wing blade, which can be contrasted with the two-dimensional pattern of sensory organs derived from discrete cells. wing blade cuticular specialization presumptive wing vein