A prosthesis has 7 basic component parts: Residual-limb gel cushion interface: A silicone gel or viscoelastic material that protects the skin and modulates pressure Suspension system: Connects the prosthesis to the body Socket: Rigid plastic receptacle into which the residual limb with gel interface is inserted (there may be an inner primary flexible socket that helps modulate forces) Joints (ankle, knee, wrist, elbow) and terminal appendage (hand, foot) Modular endoskeletal system connection couplings: Connect prosthetic joints and terminal appendages and provide adjustability Anatomic shape: Soft foam material that simulates muscle contours and protects endoskeletal components Synthetic skin: Thin, tone-matching layer applied over the anatomic shape During the fitting process, an impression of the residual limb is made either by hand-applied plaster bandages or digital imaging.