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The external surface has a tough exoskeleton which contains calcium carbonate and protects the inner organs and provides attachment to muscles. The wings are attached to the second and third thoracic segments.
The tegmina, or first pair of wings, are tough and protective, lying as a shield on top of the membranous hind wings, which are used in flight.
The mouthparts are on the underside of the head and include generalized chewing mandibles, salivary glands and various touch and taste receptors.
The body is divided into a thorax of three segments and a ten-segmented abdomen.
All four wings have branching longitudinal veins, and multiple cross-veins.
Historically, the name Blattaria was used largely interchangeably with the name Blattodea, but whilst the former name was used to refer to 'true' cockroaches exclusively, the latter also includes the termites.They are popularly depicted as dirty pests, though the great majority of species are inoffensive and live in a wide range of habitats around the world.Cockroaches are members of the order Blattodea, which includes the termites, a group of insects once thought to be separate from cockroaches.They have a relatively small head and a broad, flattened body, and most species are reddish-brown to dark brown.They have large compound eyes, two ocelli, and long, flexible antennae.
The cockroach families Corydiidae and Ectobiidae were previously known as the Polyphagidae and Blattellidae.