appendage

In Arthropods, the exoskeleton is divided into a number of plates and cylinders. At the junction point between plates and cylinders, thye exoskeleton remains thin and flexible; these are the joints. In jointed appendages, the bones that make up the appendage have contacts between them

Jointed appendages give arthropods numerous, generalized appendages which were modified into numerous specialized organs for walking, grasping, and eating.