Entomology definition of Head: the first or anterior region of the insect body,
articulated at its base to the thorax, bearing the mouth
structures and antennae. It is now believed to be made up of
seven primitive segments, named in order: 1, the ocular or
protocerebral; 2, the antenna or deutocerebral; 3, second antenna
or tritocerebral; 4, mandibular; 5, superlingual; 6, maxillary;
7, labial or 2d maxillary.