Insects are Arthropods, which means "jointed appendages". Besides the six legs, insects have other appendages which enable them to be the highly adapted organisms they truly are. Antennae, located on the head, between the eyes, are movable segmented appendages that serve a sensory function. They are used to perceive chemical stimuli. Various external mouthparts are used for chewing and grinding the food, eventually performing the function of ingestion. Two pairs of wings are outgrowths of the body wall and can be manipulated by muscles for flight. Wings are located on the thorax region. Appendages on the abdomen are for mating, such as the ovipositor. There are cerci, non--reproductive appendages for tactile sensations.