In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Q: Examples of this form of articulation are found in the hip, where the rounded head of the femur (ball) rests in the cup-like acetabulum (socket) of the pelvis, and in the glenohumeral joint of the shoulder, where the rounded head of the humerus (ball) rests in the cup-like glenoid fossa (socket) of the shoulder blade. The shoulder includes a sternoclavicular articulation joint.
A:
how did the ball and socket joint get its name