3)下颚 maxillae Maxillae are the paired appendages of segment 5 Cd adcd a It consists of 5 parts 轴节ardo(基部一节) St adst 节 stipes(下颚中央,相当于 pp- 基肢节) 外颚叶 galea(较大,有很多感觉 器官) A Ga 内颚叶 acela(有齿) 下颚须 maxillary palpus(pl. palps or P palp)(有感觉作用,5节,相当于 端肢节)