The head is enclosed in a hard, heavily sclerotized, unsegmented, exoskeletal head capsule, or epicranium, which contains most of the sensing organs, including the antennae, ocellus or eyes, and the mouthparts. Of all the insect orders, Orthoptera displays the most features found in other insects, including the sutures and sclerites. Here, the vertex, or the apex (dorsal region), is situated between the compound eyes for insects with a hypognathous and opisthognathous head. In prognathous insects, the vertex is not found between the compound eyes, but rather, where the ocelli are normally. This is because the primary axis of the head is rotated 90° to become parallel to the primary axis of the body. In some species, this region is modified and assumes a different name.:13 COUNT 5
QSN1 What part of the insect contains most of the sensing organs? ANS1 head QSN2 What is another word for head capsule? ANS2 epicranium QSN3 What displays the most features on an insect? ANS3 Orthoptera QSN4 What is the vertex also known as? ANS4 apex QSN5 The vertex is usually located between what kind of eyes? ANS5 compound