What is a "vein"?

A vein is one of the rigid, tubular structures that run through the wings of insects, providing support and rigidity. These veins are made of a chitinous material and help to maintain the shape and structure of the wing during flight. Veins in insect wings are arranged in a complex pattern, forming a network that strengthens the delicate wing membrane. They serve as channels for the flow of hemolymph, the insect equivalent of blood, delivering nutrients and oxygen to the wing tissues. The arrangement and number of veins can vary across insect species and play a crucial role in determining wing shape, strength, and functionality. The veins of an insect wing are an integral component of its flight apparatus, contributing to the insect's ability to maneuver, glide, and maintain stability while in the air.