<P> The insect thorax has three segments : the prothorax , mesothorax , and metathorax . The anterior segment , closest to the head , is the prothorax ; its major features are the first pair of legs and the pronotum . The middle segment is the mesothorax ; its major features are the second pair of legs and the anterior wings , if any . The third , the posterior , thoracic segment , abutting the abdomen , is the metathorax , which bears the third pair of legs and the posterior wings . Each segment is dilineated by an intersegmental suture . Each segment has four basic regions . The dorsal surface is called the tergum ( or notum ) to distinguish it from the abdominal terga . The two lateral regions are called the pleura ( singular : pleuron ) , and the ventral aspect is called the sternum . In turn , the notum of the prothorax is called the pronotum , the notum for the mesothorax is called the mesonotum and the notum for the metathorax is called the metanotum . Continuing with this logic , there is also the mesopleura and metapleura , as well as the mesosternum and metasternum . </P>
<P> The insect thorax has three segments : the prothorax , mesothorax , and metathorax . The anterior segment , closest to the head , is the prothorax ; its major features are the first pair of legs and the pronotum . The middle segment is the mesothorax ; its major features are the second pair of legs and the anterior wings , if any . The third , the posterior , thoracic segment , abutting the abdomen , is the metathorax , which bears the third pair of legs and the posterior wings . Each segment is dilineated by an intersegmental suture . Each segment has four basic regions . The dorsal surface is called the tergum ( or notum ) to distinguish it from the abdominal terga . The two lateral regions are called the pleura ( singular : pleuron ) , and the ventral aspect is called the sternum . In turn , the notum of the prothorax is called the pronotum , the notum for the mesothorax is called the mesonotum and the notum for the metathorax is called the metanotum . Continuing with this logic , there is also the mesopleura and metapleura , as well as the mesosternum and metasternum . </P>
where is the notum found on the insect
where is the notum found on the insect
The dorsal surface
The dorsal surface